Document:

<PAGE>

                                                                   EXHIBIT 10.18

         ============================================================

                              PETsMART.COM, INC.

                      PREFERRED STOCK PURCHASE AGREEMENT

                                 May 12, 1999

         ============================================================

<PAGE>

<TABLE>
<CAPTION>

                               TABLE OF CONTENTS
                                                                                 Page
                                                                                 ----
<C>         <S>                                                                     <C>
SECTION 1 AUTHORIZATION AND SALE OF COMMON STOCK AND PREFERRED
      STOCK

      1.1   Authorization of Preferred Stock.....................................   2
      1.2   Sale and Issuance of the Shares......................................   2
      1.3   Separate Agreements..................................................   2

SECTION 2 CLOSING DATE; DELIVERY.................................................   2

      2.1   Closing Date.........................................................   2
      2.2   Delivery and Payment.................................................   2
      2.3   Subsequent Sale of Common Stock and Preferred Stock..................   2

SECTION 3 REPRESENTATIONS AND WARRANTIES OF THE COMPANY..........................   2

      3.1   Organization and Standing; Certificate of Incorporation and Bylaws...   2
      3.2   Corporate Power......................................................   2
      3.3   Subsidiaries.........................................................   2
      3.4   Capitalization.......................................................   2
      3.5   Authorization........................................................   2
      3.6   Proprietary Rights...................................................   2
      3.7   Registration Rights..................................................   2
      3.8   Governmental Consent, etc............................................   2
      3.9   Offering.............................................................   2
     3.10   Permits..............................................................   2
     3.11   Compliance with Other Instruments....................................   2

SECTION 4 REPRESENTATIONS AND WARRANTIES OF THE PURCHASERS.......................   2

      4.1   Business and Financial Experience....................................   2
      4.2   Investment Intent; Blue Sky..........................................   2
      4.3   Rule 144.............................................................   2
      4.4   No Public Market.....................................................   2
      4.5   Restrictions on Transfer; Restrictive Legends........................   2
      4.6   Access to Data.......................................................   2
      4.7   Authorization........................................................   2
      4.8   Brokers or Finders...................................................   2
      4.9   Tax Liability........................................................   2
     4.10   Limited Operating History............................................   2

SECTION 5 CONDITIONS TO CLOSING OF THE PURCHASERS................................   2

      5.1   Representations and Warranties Correct...............................   2
      5.2   Covenants............................................................   2
      5.3   Blue Sky.............................................................   2
      5.4   Certificate..........................................................   2
      5.5   Investor Rights Agreement............................................   2
</TABLE>

                                       i
<PAGE>

                               TABLE OF CONTENTS
                                  (continued)
<TABLE>
<CAPTION>
                                                                                  Page
                                                                                  ----
<S>   <C>                                                                         <C>
      5.6   Voting Agreement.....................................................   2
      5.7   Compliance Certificate...............................................   2
      5.8   Board of Directors...................................................   2
      5.9   Legal Opinion........................................................   2
     5.10   License Agreement....................................................   2
     5.11   Strategic Relationship Terms.........................................   2
     5.12   Restricted Stock Purchase Agreements.................................   2
     5.13   Warrants.............................................................   2
     5.14   Rodale Warrant.......................................................   2
     5.15   Investment...........................................................   2
     5.16   Board Observer.......................................................   2

SECTION 6 CONDITIONS TO CLOSING OF THE COMPANY...................................   2

      6.1   Representations and Warranties Correct...............................   2
      6.2   Covenants............................................................   2
      6.3   Certificate..........................................................   2
      6.4   Investor Rights Agreement............................................   2
      6.5   Voting Agreement.....................................................   2
      6.6   License Agreement....................................................   2
      6.7   Strategic Relationship Terms.........................................   2
      6.8   Restricted Stock Purchase Agreements.................................   2

SECTION 7 MISCELLANEOUS..........................................................   2

      7.1   Governing Law........................................................   2
      7.2   Entire Agreement; Amendment..........................................   2
      7.3   Notices, etc.........................................................   2
      7.4   Delays or Omissions..................................................   2
      7.5   Counterparts.........................................................   2
      7.6   Severability.........................................................   2
      7.7   Titles and Subtitles.................................................   2
      7.8   Survival of Warranties...............................................   2
      7.9   Successors and Assigns...............................................   2
     7.10   Further Assurances...................................................   2
</TABLE>

                                       ii
<PAGE>

                              PETsMART.COM, INC.

                      PREFERRED STOCK PURCHASE AGREEMENT
                      ----------------------------------

     This Preferred Stock Purchase Agreement (this "Agreement") is made as of
May 12, 1999, by and among PETsMART.com, Inc., a Delaware corporation (the
"Company"), the purchaser of the Company's Series A Preferred Stock who are
signatories to this Agreement (the "Series A Purchaser"), the purchasers of the
Company's Series B Preferred Stock who are signatories to this Agreement (the
"Series B Purchasers"), the purchasers of the Company's Series C Preferred Stock
who are signatories to this Agreement (the "Series C Purchasers" and, together
with the Series A Purchaser and the Series B Purchasers, the "Purchasers").  The
Purchasers are listed on Exhibit A hereto.
                         ---------

                                   RECITALS

     WHEREAS, PETsMART and PetJungle, Inc., a Delaware corporation ("PetJungle")
are currently engaged, in part, in the business of selling pet products over the
Internet (the "Business");

     WHEREAS, the Company, Pittsburg, PetJungle and the Purchasers desire to
form a single entity that will engage in the Business whereby (i) PETsMART will
contribute $2,000,000 cash and certain costs associated with creating the
"PETsMART.com" web site valued at $3,010,000, (ii) the Series B Purchasers (as
defined herein) will contribute $3,006,000 in cash, (iii) the Series C
Purchasers (as defined herein) will contribute $4,008,000 in cash and (iv)
PetJungle will merge with and into the Company, thereby transferring all of its
assets to the Company (the "Merger"); and

     WHEREAS, the Company and the Purchasers desire to effect the contribution
of their capital into the Company pursuant to this Agreement (the "Financing"),
and immediately after the closing of the Financing, the Company and PetJungle
will effect the Merger.

                                   AGREEMENT

     In consideration of the mutual promises and covenants herein, the receipt
and sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

                                   SECTION 1

     AUTHORIZATION AND SALE OF COMMON STOCK AND PREFERRED STOCK

     1.1  Authorization of Preferred Stock.  The Company has authorized the
          --------------------------------
sale and issuance to the Purchasers of up to (a) 3,000,000 shares of its Series
A Preferred Stock, par value $0.001 per share (the "Series A Preferred"), (b)
1,800,000 shares of its Series B Preferred Stock, par

                                       1
<PAGE>

value $0.001 per share (the "Series B Preferred") and (c) 2,400,000 shares of
its Series C Preferred Stock, par value $0.001 per share (the "Series C
Preferred" and, together with the Series A Preferred and Series B Preferred, the
"Shares"), having the rights, preferences, privileges and restrictions as set
forth in the Amended and Restated Certificate of Incorporation in substantially
the form attached hereto as Exhibit B (the "Certificate").
                            ---------

     1.2  Sale and Issuance of the Shares.   Subject to the terms and
          -------------------------------
conditions hereof, the Company will severally issue and sell:

          (a)  to the Series A Purchaser and the Series A Purchaser will buy
from the Company up to 3,000,000 shares at a per share purchase price of $1.67
(the "Series A Per Share Price"), and at the aggregate purchase price of up to
$5,010,000, in the amount of shares specified opposite the name of the Series A
Purchaser in the column designated "Number of Shares" on Exhibit A.
                                                         -------

          (b)  to the Series B Purchasers and the Series B Purchasers will
severally buy from the Company up to 1,800,000 shares at a per share purchase
price of $1.67 (the "Series B Per Share Price"), and at the aggregate purchase
price of up to $3,006,000, in the amount of shares specified opposite the name
of each Series B Purchaser in the column designated "Number of Shares" on
Exhibit A.
---------

          (c)  to the Series C Purchasers and the Series C Purchasers will
severally buy from the Company up to 2,400,000 shares at a per share purchase
price of $1.67 (the "Series C Per Share Price"), and at the aggregate purchase
price of up to $4,008,000, in the amount of shares specified opposite the name
of each Series C Purchaser in the column designated "Number of Shares" on
Exhibit A.
---------

     1.3  Separate Agreements.  The Company's agreement with each of the
          -------------------
Purchasers hereunder is a separate agreement, the obligations of each of the
Purchasers hereunder are several and not joint, and the sale of the Shares to
each of the Purchasers is a separate transaction.

                                   SECTION 2

                            CLOSING DATE; DELIVERY

     2.1  Closing Date.  It is anticipated that purchase and sale of the Shares
          ------------
hereunder shall be consummated at a closing (the" Closing") held at the offices
of Wilson Sonsini Goodrich & Rosati, 650 Page Mill Road, Palo Alto, California
on May 12, 1999, at 4:00 p.m., local time, or at such other date, time and place
upon which the Company and the Purchasers shall agree (the date and time of the
Closing is hereinafter referred to as the "Closing Date").

     2.2  Delivery and Payment.  At the Closing, the Company will deliver to
          --------------------
each Purchaser a certificate or certificates, registered in the Purchaser's
name, representing the number of Shares to

                                       2
<PAGE>

be purchased by the Purchaser at the Closing, against payment of the purchase
price therefor, by (i) check payable to the Company, (ii) by wire transfer per
the Company's instructions, (iii) by any combination of (i) and (ii) above or
(iv) with respect to the Series A Purchaser, a combination of (i) and (ii) above
and by the delivery to the Company, at the time of execution of this Agreement,
of the General Assignment of Assets by and between the Company and the Series A
Purchaser, in the form attached hereto as Exhibit M, whereby the Purchaser shall
                                          ---------
assign to the Company all of its rights in the property listed as an exhibit
thereto.

     2.3  Subsequent Sale of Common Stock and Preferred Stock.  If less than all
          ---------------------------------------------------
of the authorized number of shares of Series A Preferred Stock, Series B
Preferred Stock or Series C Preferred Stock are sold at the Closing, then,
subject to the terms and conditions of this Agreement, the Company may sell up
to the balance of the authorized but unissued Series A Preferred Stock, Series B
Preferred Stock or Series C Preferred Stock, as the case may be, to such persons
as the Board of Directors of the Company may determine at the same price per
share as the Shares sold at the Closing. Any such sale shall be made upon the
same terms and conditions as those contained herein, and such persons or
entities shall become parties to this Agreement, the Voting Agreement and the
Investor Rights Agreement (each as defined herein), and shall have the rights
and obligations of a Purchaser hereunder or thereunder.

                                   SECTION 3

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     Except as set forth on the Schedule of Exceptions (the "Schedule of
Exceptions") attached hereto as Exhibit C, the Company represents and warrants
                                ---------
to the Purchasers that, as of the Closing Date at which the Purchasers
consummate their purchase of Shares hereunder:

     3.1  Organization and Standing; Certificate of Incorporation and Bylaws.
          ------------------------------------------------------------------
The Company is a corporation duly organized and validly existing under, and by
virtue of, the laws of the State of Delaware and is in good standing under such
laws. The Company has requisite corporate power and authority to own and operate
its properties and assets and to carry on its business as presently conducted
and as proposed to be conducted. The Company is presently qualified to do
business as a foreign corporation in California and there is no other
jurisdiction in which the failure to be so qualified would have a material
adverse effect on the business or financial condition of the Company. The
Company has furnished counsel for the Purchasers with copies of its Certificate
and Bylaws. Said copies are true, correct and complete and reflect all
amendments now in effect.

     3.2  Corporate Power.  The Company has all requisite legal and corporate
          ---------------
power and authority to execute and deliver this Agreement, the Investor Rights
Agreement in substantially the form attached hereto as Exhibit D (the "Investor
                                                       ---------
Rights Agreement"), the Voting Agreement in substantially the form attached
hereto as Exhibit E (the "Voting Agreement" and, together with this Agreement
          ---------
and the Investor Rights Agreement, the "Investment Agreements"), to sell and
issue the Shares hereunder, to issue the underlying Common Stock (the
"Conversion Stock") in accordance

                                       3
<PAGE>

with the provisions of the Certificate, and to carry out and perform its
obligations under the terms of the Investment Agreements.

     3.3  Subsidiaries.  Except as provided in the Schedule of Exceptions, the
     ------------
Company has no subsidiaries or affiliated companies and does not otherwise own
or control, directly or indirectly, any equity interest in any corporation,
association or business entity.

     3.4  Capitalization.  The authorized capital stock of the Company will,
          --------------
upon the filing of the Certificate, consist of 50,000,000 shares of Common Stock
and 7,905,770 shares of Preferred Stock, 3,300,000 of which have been designated
Series A Preferred, 1,800,000 of which have been designated Series B Preferred
Stock, 2,805,770 of which have been designated Series C Preferred Stock. As of
the Closing Date, no shares of Common Stock, Series A Preferred Stock, Series B
Preferred Stock or Series C Preferred Stock will be outstanding. The Shares
shall have the rights, preferences, privileges and restrictions set forth in the
Certificate. The Company has reserved (i) 3,000,000 shares of Series A Preferred
for issuance hereunder and 300,000 shares for issuance upon exercise of a
warrant granted to PETsMART on the date hereof, (ii) 1,800,000 shares of Series
B Preferred for issuance hereunder, (iii) 2,400,000 shares of Series C Preferred
for issuance hereunder and 405,668 shares for issuance upon exercise warrants
granted to Rodale Press, Inc. and idealab! Holdings, L.L.C. on the date hereof,
(iv) 26,802,247 shares of Common Stock for issuance upon conversion of the
Preferred and (v) 1,430,394 shares of Common Stock for issuance to the Company's
executives pursuant to certain restricted stock purchase agreements entered into
between the Company and certain executives as of the date hereof. Except as set
forth above and as provided in the Company's Certificate and the Schedule of
Exceptions, there are no options, warrants or other rights to purchase or
acquire any of the Company's authorized and unissued capital stock.

     3.5  Authorization.  All corporate action on the part of the Company and
          -------------
its directors necessary for the authorization, execution, delivery and
performance of the Investment Agreements by the Company, the authorization,
sale, issuance and delivery of the Shares and the Conversion Stock and the
performance of the Company's obligations under the Investment Agreements has
been taken or will be taken prior to the Closing. The Investment Agreements,
when executed and delivered by the Company, shall constitute valid and binding
obligations of the Company, enforceable in accordance with their terms, subject
to laws of general application relating to bankruptcy, insolvency and the relief
of debtors and rules of law governing specific performance, injunctive relief or
other equitable remedies; provided, however, that the Company makes no
                          --------  -------
representation as to the enforceability of the indemnification provisions
contained in the Investor Rights Agreement. The Shares, when issued in
compliance with the provisions of this Agreement, will be validly issued, fully
paid and nonassessable, and will have the rights, preferences, privileges and
restrictions described in the Certificate; the Common Stock issuable upon
conversion of the Shares has been duly and validly reserved and, when issued in
compliance with the provisions of the Certificate, will be validly issued, fully
paid and nonassessable; and the Shares and the Conversion Stock will be free of
any liens or encumbrances (assuming the Purchaser takes the Shares with no
notice thereof) other than any liens or encumbrances created by or imposed upon
the holders; provided, however, that the Shares and the Conversion Stock may be
subject to restrictions on transfer under state or federal securities laws and
restrictions set forth in the Investor Rights

                                       4
<PAGE>

Agreement. The issuance of the Shares is not subject to any preemptive rights or
rights of first refusal.

     3.6  Proprietary Rights.  The Company has title and ownership of, or full
          ------------------
right to use, all patents, trademarks, service marks, trade names, copyrights,
trade secrets, information, proprietary rights and processes necessary for its
business as now conducted and, to the Company's knowledge, without any conflict
with or infringement of the rights of others. There are no outstanding options,
licenses, or agreements of any kind relating to the foregoing, nor is the
Company bound by or a party to any options, licenses or agreements of any kind
with respect to the patents, trademarks, service marks, trade names, copyrights,
trade secrets, licenses, information, proprietary rights and processes of any
other person or entity. The Company has not received any communications alleging
that the Company has violated or, by conducting its business as currently
conducted, would violate any of the patents, trademarks, service marks, trade
names, copyrights or trade proprietary rights of any other person or entity. To
the knowledge of the Company, none of its employees is obligated under any
contract (including licenses, covenants or commitments of any nature) or other
agreement, or subject to any judgment, decree or order of any court or
administrative agency, that would interfere with the use of his or her best
efforts to promote the interests of the Company or that would conflict with the
Company's business as currently conducted. Neither the execution and delivery of
the Investment Agreements, nor the carrying on of the Company's business by the
employees of the Company, nor the conduct of the Company's business as currently
conducted, will, to the Company's knowledge, conflict with or result in a breach
of the terms, conditions or provisions of, or constitute a default under, any
contract, covenant or instrument under which any of such employees is now
obligated. The Company does not believe it is or will be necessary to utilize
any inventions of any of its employees (or people it currently intends to hire)
made prior to their employment by the Company.

     3.7  Registration Rights.  Except as set forth in the Investor Rights
          -------------------
Agreement, the Company is not under any contractual obligation to register under
the Securities Act of 1933, as amended (the "Securities Act"), any of its
presently outstanding securities or any of its securities which may hereafter be
issued.

     3.8  Governmental Consent, etc.  No consent, approval order or
          -------------------------
authorization of or registration, qualification, designation, declaration or
filing with any governmental authority on the part of the Company is required in
connection with the valid execution and delivery of the Investment Agreements,
or the offer, sale or issuance of the Shares or the Conversion Stock, or the
consummation of any other transaction contemplated hereby, except (i) the filing
of the Certificate in the office of the Delaware Secretary of State prior to the
Closing and (ii) the qualification (or taking of such action as may be necessary
to secure an exemption from qualification, if available) of the offer and sale
of the Shares and the Conversion Stock under applicable Blue Sky laws, which
filings and qualifications, if required, will be accomplished in a timely
manner.

     3.9  Offering.  Subject to the accuracy of the Purchaser's representations
          --------
in Section 4 hereof, the offer, sale and issuance of the Shares and the
Conversion Stock constitute transactions exempt from the registration
requirements of Section 5 of the Securities Act.

                                       5
<PAGE>

     3.10  Permits.  The Company has all franchises, permits, licenses, and any
           -------
similar authority necessary for the conduct of its business as now being
conducted by it, the lack of which could materially and adversely affect the
business, properties, or financial condition of the Company, and the Company
believes it can obtain, without undue burden or expense, any similar authority
for the conduct of its business as planned to be conducted. To its knowledge,
the Company is not in default in any material respect under any of such
franchises, permits, licenses, or other similar authority.

     3.11  Compliance with Other Instruments.  The Company is not in violation
           ---------------------------------
of any term of the Certificate or Bylaws, or in any respect of any term or
provision of any mortgage, indenture, contract, agreement, instrument, judgment
or decree, and to its knowledge, is not in violation of any order, statute, rule
or regulation applicable to the Company, which violation reasonably would be
expected to have a material adverse effect on the Company's business. The
execution, delivery and performance of and compliance with this Agreement, and
the Investment Agreements and the consummation of the transactions contemplated
hereby and thereby, and the issuance of the Shares and the Conversion Shares,
have not resulted and will not result in any violation of, or conflict with, or
constitute a default under any such term or provision, or result in the creation
of, any mortgage, pledge, lien, encumbrance or charge upon any of the properties
or assets of the Company; and there is no such violation or default or event
which, with the passage of time or giving of notice or both, would constitute a
violation or default which would materially and adversely affect the business of
the Company or any of its properties or assets.

                                   SECTION 4

               REPRESENTATIONS AND WARRANTIES OF THE PURCHASERS

     Each Purchaser hereby severally (and not jointly) represents and warrants
to the Company as follows:

     4.1  Business and Financial Experience.  Its knowledge and experience in
          ---------------------------------
financial and business matters are such that its is capable of evaluating the
merits and risks of its purchase of the Shares and the underlying Conversion
Stock as contemplated by this Agreement. Its financial situation is such that it
can afford to bear the economic risk of holding the Shares and the underlying
Conversion Stock for an indefinite period of time and suffer complete loss of
its investment.

     4.2  Investment Intent; Blue Sky.  It is acquiring the Shares and the
          ---------------------------
underlying Conversion Stock for investment for its own account, not as a nominee
or agent, and not with a view to, or for resale in connection with, any
distribution thereof.  It understands that the issuance of the Shares and the
underlying Conversion Stock has not been, and will not be, registered under the
Securities Act by reason of a specific exemption from the registration
provisions of the Securities Act, the availability of which depends upon, among
other things, the bona fide nature of the Purchaser's investment intent and the
accuracy of the Purchaser's representations as expressed herein.  The
Purchaser's address set forth on the Schedule of Purchasers attached hereto as
Exhibit A
---------

                                       6
<PAGE>

represents the Purchaser's true and correct state of domicile, upon which the
Company may rely for the purpose of complying with applicable Blue Sky laws.

     4.3  Rule 144.  It acknowledges that the Shares and the underlying
          --------
Conversion Stock must be held indefinitely unless subsequently registered under
the Securities Act or unless an exemption from such registration is available.
It is aware of the provisions of Rule 144 promulgated under the Securities Act
which permit limited resale of shares purchased in a private placement subject
to the satisfaction of certain conditions, including, among other things, the
existence of a public market for the shares, the availability of certain current
public information about the Company, the resale occurring not less than one
year after a party has purchased and paid for the security to be sold, the sale
being effected through a "broker's transaction" or in a transaction directly
with a "market maker," and the number of shares being sold during any three-
month period not exceeding specified limitations.

     4.4  No Public Market.  It understands that no public market now exists for
          ----------------
any of the securities issued by the Company and that the Company has made no
assurances that a public market will ever exist for the Company's securities.

     4.5  Restrictions on Transfer; Restrictive Legends.  It understands
          ---------------------------------------------
that the transfer of the Shares and the Conversion Stock, if applicable, is
restricted by applicable state and Federal securities laws and by the provisions
of the Investor Rights Agreement and the Voting Agreement, and that the
certificates representing the Shares and the Conversion Stock will be imprinted
with legends restricting transfer except in compliance therewith.

     4.6  Access to Data.  It has had an opportunity to discuss the Company's
          --------------
business, management and financial affairs with the Company's management. It has
also had an opportunity to ask questions of officers of the Company. It
understands that such discussions, as well as any written information issued by
the Company, were intended to describe the material aspects of the Company's
business and prospects but were not a thorough or exhaustive description.

     4.7  Authorization.  All action on the part of the Purchaser's partners,
          -------------
board of directors, and stockholders, as applicable, necessary for the
authorization, execution, delivery and performance of the Investment Agreements
by the Purchaser, the purchase of and payment for the Shares and the Conversion
Stock, if applicable, and the performance of all of the Purchaser's obligations
under the Investment Agreements has been taken or will be taken prior to the
Closing. The Investment Agreements, when executed and delivered by the
Purchaser, shall constitute valid and binding obligations of the Purchaser,
enforceable in accordance with their terms, subject to laws of general
application relating to bankruptcy, insolvency and the relief of debtors and
rules of law governing specific performance, injunctive relief or other
equitable remedies; provided, however, that the Purchaser makes no
representation as to the enforceability of the indemnification provisions
contained in the Investor Rights Agreement.

     4.8  Brokers or Finders.  The Company has not and will not incur,
          ------------------
directly or indirectly, as a result of any action taken by the Purchaser, any
liability for brokerage or finders' fees or agents'

                                       7
<PAGE>

commissions or any similar charges in connection with this Agreement or the
transactions contemplated hereby.

     4.9  Tax Liability.  It has reviewed with its own tax advisors the tax
          -------------
consequences of the transactions contemplated by this Agreement. It relies
solely on such advisors and not on any statements or representations of the
Company or any of the Company's agents with respect to such tax consequences. It
understands that it, and not the Company, shall be responsible for its own tax
liability that may arise as a result of the transactions contemplated by this
Agreement.

     4.10 Limited Operating History.  It acknowledges that the Company was
          -------------------------
incorporated on May 6, 1999 and has a limited operating history.

                                   SECTION 5

                    CONDITIONS TO CLOSING OF THE PURCHASERS

     Each Purchaser's obligation to purchase the Shares is, unless waived in
writing by the Purchaser, subject to the fulfillment as of the date of Closing
of the following conditions:

     5.1  Representations and Warranties Correct.  The representations and
          --------------------------------------
warranties made in Section 3 hereof by the Company shall be true and correct in
all material respects as of the date of the Closing.

     5.2  Covenants.  All covenants, agreements and conditions contained in this
          ---------
Agreement to be performed or complied with by the Company on or prior to the
Closing Date shall have been performed or complied with in all material
respects.

     5.3  Blue Sky.  The Company shall have obtained all necessary Blue Sky law
          --------
permits and qualifications, or have the availability of exemptions therefrom,
required by any state for the offer and sale of the Shares and the underlying
Conversion Stock.

     5.4  Certificate.  The Certificate shall have been properly filed in the
          -----------
office of the Delaware Secretary of State.

     5.5  Investor Rights Agreement.  The Company shall have executed and
          -------------------------
delivered the Investor Rights Agreement in substantially the form attached
hereto as Exhibit D.
          ---------

     5.6  Voting Agreement.  The Company and each of the Purchasers shall
          ----------------
have executed and delivered the Voting Agreement in substantially the form
attached hereto as Exhibit E.
                   ----------

     5.7  Compliance Certificate.  The Company shall have delivered to the
          ----------------------
Purchasers a certificate of the Company in substantially the form attached
hereto as Exhibit F, executed by the President of the Company, dated as of the
          ---------
date of the Closing and certifying to the fulfillment of the conditions
specified in Sections 5.1 and 5.2 of this Agreement.

                                       8
<PAGE>

     5.8  Board of Directors.  Upon the Closing, the number of directors
          ------------------
constituting the Board of Directors shall be seven (7).  Thereupon, the Board of
Directors shall consist of Bill Gross, Robert Kavner, Tom McGovern, Yves
Sisteron, Samuel J. Parker, Philip L. Francis and Neil Watanabe.

     5.9  Legal Opinion.  The Purchasers shall have received an opinion of
          -------------
Wilson Sonsini Goodrich & Rosati, counsel to the Company, in substantially the
form attached hereto as Exhibit G.
                        ---------

     5.10 License Agreement.  The Company and PETsMART shall have executed and
          -----------------
delivered the License Agreement in substantially the form attached hereto as
Exhibit H.
---------

     5.11 Strategic Relationship Terms.  The Company and PETsMART shall have
          ----------------------------
executed and delivered the Strategic Relationship Terms in substantially the
form attached hereto as Exhibit I.
                        ---------

     5.12 Restricted Stock Purchase Agreements.  The Company shall have executed
          ------------------------------------
and delivered to each of Tom McGovern and Carina Schaldach a Restricted Stock
Purchase Agreement in the form attached hereto as Exhibit J entitling them to
                                                  ---------
purchase 1,043,111 and 387,283 shares of Common Stock, respectively, at a
          ---------
purchase price of $.20 per share.

     5.13 Warrants.  The Company shall have executed and delivered to (i) each
          --------
of idealab! Holdings, L.L.C. and Rodale Press, Inc. a Series C Preferred Stock
Purchase Warrant to purchase 339,278 and 43,227 shares of Series C Preferred
Stock, respectively, and (ii) PETsMART a Series A Preferred Stock Purchase
Warrant to purchase 300,000 shares of Series A Preferred Stock, each in the form
attached hereto as Exhibit K.
                   ---------

     5.14 Rodale Warrant.  The Company shall have executed and delivered to
          --------------
Rodale Press, Inc. a Series C Stock Purchase Warrant to purchase 23,163 shares
of Series C Preferred Stock in the form attached hereto as Exhibit L.
                                                           ---------

     5.15 Investment.  Purchasers shall have tendered, in the aggregate, at the
          ----------
Closing, consideration of not less than $8,000,000.

     5.16  Board Observer.  The Company shall have executed and delivered to
           --------------
Rodale Press, Inc. a letter agreement regarding the grant of observer rights to
Rodale Press, Inc. on the Company's Board of Directors.

                                   SECTION 6

                     CONDITIONS TO CLOSING OF THE COMPANY

     The Company's obligation to sell and issue the Shares is, unless waived in
writing by the Company, subject to the fulfillment as of the date of Closing of
the following conditions:

                                       9
<PAGE>

     6.1  Representations and Warranties Correct.  The representations and
          --------------------------------------
warranties made in Section 4 hereof by the Purchasers shall be true and correct
in all material respects as of the date of the Closing.

     6.2  Covenants.  All covenants, agreements, and conditions contained in
          ---------
this Agreement to be performed or complied with by the Purchasers on or prior to
the Closing Date shall have been performed or complied with in all material
respects.

     6.3  Certificate.  The Certificate shall have been filed in the office of
          -----------
the Delaware Secretary of State.

     6.4  Investor Rights Agreement.  The Purchasers shall have executed and
          -------------------------
delivered the Investor Rights Agreement in substantially the form attached
hereto as Exhibit D.
          ---------

     6.5  Voting Agreement.  The Purchasers shall have executed and delivered
          ----------------
the Voting Agreement in substantially the form attached hereto as Exhibit E.
                                                                  ---------
     6.6  License Agreement. The Company and PETsMART shall have executed and
          -----------------
delivered the License Agreement in substantially the form attached hereto as
Exhibit H.
---------

     6.7  Strategic Relationship Terms.  The Company and PETsMART shall have
          ----------------------------
executed and delivered the Strategic Relationship Terms in substantially the
form attached hereto as Exhibit I.
                        ---------

     6.8  Restricted Stock Purchase Agreements.  The Tom McGovern and Carina
          ------------------------------------
Schaldach shall have executed and delivered to the Company a Restricted Stock
Purchase Agreement in the form attached hereto as Exhibit J entitling them to
                                                  ---------
purchase 1,043,111 and 387,283 shares of Common Stock, respectively, at a
---------
purchase price of $.20 per share.

                                   SECTION 7

                                 MISCELLANEOUS

     7.1  Governing Law.  This Agreement shall be governed in all respects
          -------------
by the internal laws of the State of California without regard to conflict of
laws provisions.

     7.2  Entire Agreement; Amendment.  This Agreement, the Investor Rights
          ---------------------------
Agreement, the Voting Agreement and the other documents delivered pursuant
hereto, including the exhibits hereto, constitute the full and entire
understanding and agreement among the parties with regard to the subjects hereof
and thereof, and no party shall be liable or bound to any other party in any
manner by any warranties, representations or covenants except as specifically
set forth herein or therein. Except as expressly provided herein, neither this
Agreement nor any term hereof may be amended, waived, discharged or terminated
other than by a written instrument signed by the party against whom enforcement
of any such amendment, waiver, discharge or termination is sought.

                                       10
<PAGE>

     7.3  Notices, etc.  All notices and other communications required or
          ------------
permitted hereunder shall be in writing and shall be mailed by registered or
certified mail, postage prepaid, or otherwise delivered by facsimile
transmission, by hand or by messenger, addressed:

          (a)  if to a Purchaser, to the address or fax number listed after such
Purchaser's name on the Schedule of Purchasers attached hereto as Exhibit A or
                                                                  ---------
at such other address as such Purchaser shall have furnished to the Company.

          (b)      if to the Company, to:

                   PETsMART.com, Inc.
                   130 West Union Street
                   Pasadena, CA  91103
                   Attn:  Tom McGovern
                   Fax:  (626) 535-2701

or at such other address as the Company shall have furnished to the Purchasers,
with a copy to:

                   Wilson Sonsini Goodrich & Rosati
                   650 Page Mill Road
                   Palo Alto, California 94304-1050
                   Attn:  Martin W. Korman, Esq.
                   Fax:  (650) 493-6811

          Each such notice or other communication shall for all purposes of this
Agreement be treated as effective or having been given when received if
delivered personally, if sent by facsimile, the first business day after the
date of confirmation that the facsimile has been successfully transmitted to the
facsimile number for the party notified, or, if sent by mail, at the earlier of
its receipt or 72 hours after the same has been deposited in a regularly
maintained receptacle for the deposit of the United States mail, addressed and
mailed as aforesaid.

     7.4  Delays or Omissions.  Except as expressly provided herein, no delay or
          -------------------
omission to exercise any right, power or remedy accruing to any party, upon any
breach or default of another party under this Agreement, shall impair any such
right, power or remedy of such party nor shall it be construed to be a waiver of
any such breach or default, or an acquiescence therein, or of any similar breach
or default thereafter occurring; nor shall any waiver of any single breach or
default be deemed a waiver of any other breach or default theretofore or
thereafter occurring. Any waiver, permit, consent or approval of any kind or
character on the part of any party of any breach or default under this
Agreement, or any waiver on the part of any party of any provisions or
conditions of this Agreement, must be in writing and shall be effective only to
the extent specifically set forth in such writing. All remedies, either under
this Agreement or by law or otherwise afforded to any party, shall be cumulative
and not alternative.

                                       11
<PAGE>

     7.5  Counterparts.  This Agreement may be executed in any number of
          ------------
counterparts, each of which shall be an original, and all of which together
shall constitute one instrument.

     7.6  Severability.  In the event that any provision of this Agreement
          ------------
becomes or is declared by a court of competent jurisdiction to be illegal,
unenforceable or void, this Agreement shall continue in full force and effect
without said provision, which shall be replaced with an enforceable provision
closest in intent and economic effect as the severed provision; provided that no
such severability shall be effective if it materially changes the economic
benefit of this Agreement to any party.

     7.7  Titles and Subtitles.  The titles and subtitles used in this Agreement
          --------------------
are used for convenience only and are not to be considered in construing or
interpreting this Agreement.

     7.8  Survival of Warranties.  The warranties, representations and
          ----------------------
covenants of the Company and the Purchasers contained in or made pursuant to
this Agreement shall survive execution and delivery of this Agreement and the
Closing for a period of one hundred eighty (180) days and shall in no way be
affected by any investigation of the subject matter thereof made by or on behalf
of the Purchasers or the Company.

     7.9  Successors and Assigns.  Except as otherwise expressly provided
          ----------------------
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the successors, permitted assigns, heirs, executors and administrators of
the parties hereto.

     7.10 Further Assurances.  Each party hereto agrees to do all acts and
          ------------------
things, and to make, execute and delivery such written instruments, as shall
from time to time be reasonably required to carry out the terms and provisions
of this Agreement.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       12
<PAGE>

     The foregoing agreement is hereby executed effective as of the date first
set forth above.

"COMPANY"

PETsMART.COM, INC.

     /s/ Tom McGovern
-----------------------------
Tom McGovern, Jr.
President
<PAGE>

                                    "SERIES A PURCHASER"

                                    PETsMART, INC.

                                         /s/ Philip L. Francis
                                    --------------------------------------
                                    Philip L. Francis
                                    President and Chief Executive Officer
<PAGE>

"SERIES B PURCHASERS"

IDEALAB! CAPITAL PARTNERS I-B, L.P.

     /s/ William S. Elkus
-----------------------------------
William S. Elkus,
Managing member, idealab! Capital Management, I, LLC,
General Partner of idealab! Capital Partners I-B, L.P.

IDEALAB! CAPITAL PARTNERS I-A, L.P.

      /s/ William S. Elkus
-----------------------------------
William S. Elkus,
Managing member, idealab! Capital Management, I, LLC,
General Partner of idealab! Capital Partners I-A, L.P.

SIMBA, LLC

By:    /s/ Carina Schaldach
   ---------------------------------
Name       Carina Schaldach
    --------------------------------
Title:
      ------------------------------

WS INVESTMENT COMPANY 99A

By: /s/ James A. Terranova
   ---------------------------------
Name      James A. Terranova
     -------------------------------
Title:       Adminstrator
      ------------------------------

------------------------------------

<PAGE>

"SERIES B PURCHASERS"

     /s/ Larry W. Sonsini
------------------------------------
LARRY SONSINI

     /s/ Martin W. Korman
------------------------------------
MARTIN W. KORMAN
<PAGE>

"SERIES B PURCHASERS"

GLOBAL RETAIL PARTNERS, L.P.
BY:  GLOBAL RETAIL PARTNERS, INC.

By:   /s/ Osamu R. Watanabe
------------------------------------
Name:     Osamu R. Watanabe
     -------------------------------
Title:         Vice President
      ------------------------------

DLJ DIVERSIFIED PARTNERS, L.P.
BY:  DLJ DIVERSIFIED PARTNERS, INC.
     General Partner

By:   /s/ Osamu R. Watanabe
------------------------------------
Name:     Osamu R. Watanabe
     -------------------------------
Title:    Vice President
      ------------------------------

DLJ DIVERSIFIED PARTNERS-A, L.P.
BY:  DLJ DIVERSIFIED PARTNERS, INC.
     General Partner

By:   /s/ Osamu R. Watanabe
------------------------------------
Name:     Osamu R. Watanabe
     -------------------------------
Title:    Vice President
      ------------------------------

GRP PARTNERS, L.P.
BY:  GLOBAL RETAIL PARTNERS, INC.
     General Partner

By:   /s/ Osamu R. Watanabe
   ---------------------------------
Name:     Osamu R. Watanabe
     -------------------------------
Title:    Vice President
      ------------------------------
<PAGE>

"SERIES B PURCHASERS"

GLOBAL RETAIL PARTNERS FUNDING, INC.

By:   /s/ Osamu R. Watanabe
   ---------------------------------
Name:     Osamu R. Watanabe
     -------------------------------
Title:    Vice President
      ------------------------------

DLJ ESC II L.P.
BY:  DLJ LBO PLANS MANAGEMENT CORPORATION
     General Partner

By:   /s/ Osamu R. Watanabe
   ---------------------------------
Name:     Osamu R. Watanabe
     -------------------------------
Title:    Vice President
      ------------------------------

<PAGE>

"SERIES B PURCHASERS"

     /s/ Richard Horn
------------------------------------
RICK HORN

     /s/ Mark Williams
------------------------------------
MARK WILLIAMS

     /s/ M. Houlahan
------------------------------------
MICHAEL HOULAHAN

     /s/ Tom McGovern
------------------------------------
TOM MCGOVERN, JR.
<PAGE>

"SERIES C PURCHASERS"

IDEALAB! HOLDINGS, L.L.C.

     /s/ Marcia Goodstein
------------------------------------
Marcia Goodstein, Secretary

RODALE PRESS, INC.

     /s/ Placido A. Corpora
------------------------------------
Pat Corpora, President

PORTOFINO INVESTMENTS LIMITED PARTNERSHIP I

By:   /s/ David Camel
   --------------------------------------
Name:     David Camel
     ------------------------------------
Title:    Vice President, General Partner
      -----------------------------------

     /s/ Robert Kavner
------------------------------------------------------
ROBERT KAVNER

     /s/ Daniel Herrick
------------------------------------------------------
DANIEL HERRICK

     /s/ Charles Gordon      /s/ Dorothea M. Gordon
------------------------------------------------------
DOROTHEA M. AND CHARLES GORDON

     /s/ Tom McGovern
------------------------------------------------------
TOM McGOVERN
<PAGE>

"SERIES C PURCHASERS"

     /s/ Carina Schaldach
------------------------------------
CARINA SCHALDACH

     /s/ M. Houlahan
------------------------------------
MIKE HOULAHAN

     /s/ Kyle Hansen
------------------------------------
KYLE HANSEN
<PAGE>

                                   EXHIBIT A
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                        Schedule of Series A Purchasers
                        -------------------------------

Name and Address                                        Number of Shares

PETsMART, Inc.                                              3,000,000
19601 N. 27TH Avenue
Phoenix, AZ  85027
Attn: Philip L. Francis
Phone: (623) 580-6100
Facsimile: (623) 580-6513

with a copy to:
Cooley Godward, LLP
Five Palo Alto Square
300 El Camino Real
Palo Alto, CA  94306-2155
Attn:  Bob Brigham, Esq.

TOTAL                                                       3,000,000
<PAGE>

                        Schedule of Series B Purchasers
                        -------------------------------

Name and Address                                          Number of Shares

idealab! Capital Partners I-A, L.P.                         72,000
130 West Union Street
Pasadena, CA  91103
Attn: William Elkus
Telephone:  (626) 535-2882
Facsimile: (626) 535-2881

idealab! Capital Partners I-B, L.P.                         378,000
130 West Union Street
Pasadena, CA  91103
Attn:  William Elkus
Telephone: (626) 535-2882
Facsimile: (626) 535-2881

with a copy to:
Strategic Law Partners
333 S. Grand Avenue, Suite 3950
Los Angeles, CA  90071
Attn:  James K. Baer
Telephone:  (213) 617-8960
Facsimile:  (213) 617-8961

Simba, L.L.C.                                               63,000
130 W. Union Street
Pasadena, CA  91103
Attn:  Carina Schaldach
Telephone:  (626) 535-2831
Facsimile:  (626) 535-2701

WS Investment Company 99A                                   8,100
650 Page Mill Road
Palo Alto, CA  94303
Attn:  Jim Terranova
Telephone:  (650) 493-9300
Facsimile:  (650) 493-6811
<PAGE>

Name and Address                                        Number of Shares

Larry Sonsini                                               6,450
650 Page Mill Road
Palo Alto, CA  94303
Telephone:  (650) 493-9300
Facsimile:  (650) 493-6811

Martin W. Korman                                            450
650 Page Mill Road
Palo Alto, CA  94303
Telephone:  (650) 493-9300
Facsimile:  (650) 493-6811

Rick Horn                                                   15,000
PETsMART, Inc.
19601 N. 27TH Avenue
Phoenix, AZ  85027
Phone: (623) 580-6100
Facsimile: (623) 580-6513

Mark Williams                                               15,000
PETsMART, Inc.
19601 N. 27TH Avenue
Phoenix, AZ  85027
Phone: (623) 580-6100
Facsimile: (623) 580-6513

Tom McGovern, Jr.                                           30,000
130 W. Union Street
Pasadena, CA  91103
Telephone:  (626) 535-2735
Facsimile:  (626) 535-2701

Michael Houlahan                                            12,000
130 W. Union Street
Pasadena, CA  91103
Telephone:  (626) 535-2735
Facsimile:  (626) 535-2701
<PAGE>

Name and Address                                        Number of Shares

Global Retail Partners, L.P.                                769,365
277 Park Avenue, 19th Floor
New York, NY  10172
Attn:  Nicole Arnaboldi
Telephone:  (212) 892-3000
Facsimile:  (212) 892-7552

with a copy to:
Global Retail Partners, L.P.
2121 Avenue of the Stars, 30th Floor
Los Angeles, CA  90067
Attn:  Osamu Watanabe
Telephone:  (310) 282-6100
Facsimile:  (310) 282-6178

DLJ Diversified Partners, L.P.                              229,261
277 Park Avenue, 19th Floor
New York, NY  10172
Attn:  Nicole Arnaboldi
Telephone:  (212) 892-3000
Facsimile:  (212) 892-7552

with a copy to:
DLJ Diversified Partners, L.P.
277 Park Avenue, 23rd Floor
New York, NY  10172
Attn:  Ivy Dodes
Telephone:  (212) 892-3000
Facsimile:  (212) 892-2689
<PAGE>

Name and Address                                        Number of Shares

DLJ Diversified Partners-A, L.P.                            85,137
277 Park Avenue, 19th Floor
New York, NY  10172
Attn:  Nicole Arnaboldi
Telephone:  (212) 892-3000
Facsimile:  (212) 892-7552

with a copy to:
DLJ Diversified Partners-A, L.P.
277 Park Avenue, 23rd Floor
New York, NY  10172
Attn:  Ivy Dodes
Telephone:  (212) 892-3000
Facsimile:  (212) 892-2689

GRP Partners, L.P.                                          50,016
277 Park Avenue, 19th Floor
New York, NY  10172
Attn:  Nicole Arnaboldi
Telephone:  (212) 892-3000
Facsimile:  (212) 892-7552

with a copy to:
GRP Partners, L.P.
2121 Avenue of the Stars, 30th Floor
Los Angeles, CA  90067
Attn:  Osamu Watanabe
Telephone:  (310) 282-6100
Facsimile:  (310) 282-6178
<PAGE>

Name and Address                                        Number of Shares

Global Retail Partners Funding, Inc.                        52,978
277 Park Avenue, 19th Floor
New York, NY  10172
Attn: Nicole Arnaboldi
Telephone:  (212) 892-3000
Facsimile:  (212) 892-7552

with a copy to:
Global Retail Partners Funding, Inc.
2121 Avenue of the Stars, 30th Floor
Los Angeles, CA  90067
Attn: Osamu Watanabe
Telephone:  (310) 282-6100
Facsimile:  (310) 282-6178

DLJ ESC II L.P.                                             13,243
277 Park Avenue, 19th Floor
New York, NY  10172
Attn:  Ed Poletti
Telephone:  (212) 892-3000
Facsimile:  (212) 892-7572

TOTAL                                                       1,800,000
<PAGE>

                        Schedule of Series C Purchasers
                        -------------------------------

Name and Address                                          Number of Shares

idealab! Holdings, L.L.C.                                   1,968,000
130 W. Union Street
Pasadena, CA  91103
Attn:  Marcia Goodstein
Telephone:  (626) 585-6900
Facsimile:  (626) 535-2701

Rodale Press, Inc.                                          240,000
400 S. 10th St.
Emmaus, PA  18098
Attn:  Pat Corpora
Telephone:  (610) 967-8251
Facsimile: (610) 967-9154

with a copy to:
Gross, McGinley, LaBarre & Eaton, LLP
33 South 7th Street
P.O. Box 4060
Allentown, PA  18101
Attn:  Paul A. McGinley, Esq.
Telephone:  (610) 820-5450
Facsimile:  (610) 820-6006

Robert Kavner                                               38,400
20680 Leonard Road
Saratoga, CA  95070
Telephone:  (408) 867-9850
Facsimile:  (408) 867-9853

Daniel Herrick                                              19,200
55 Eaton Mews North
London, SW1X 8LL, England
Telephone:  011 44 171 235 2736
Facsimile:  011 44 171 245 0882

Dorothea M. & Charles Gordon                                14,400
1963 Golden Way
Mountain View, CA  94040
Telephone:  (650) 967-5056
<PAGE>

Name and Address                                        Number of Shares

Tom McGovern, Jr.                                           48,000
130 W. Union Street
Pasadena, CA  91103
Telephone:  (626) 535-2735
Facsimile:  (626) 535-2701

Carina Schaldach                                            28,800
130 W. Union Street
Pasadena, CA  91103
Telephone:  (626) 535-2831
Facsimile:  (626) 535-2701

Portofino Investments I Limited Partnership                 19,200
301 E. Clark Avenue, Suite 700
Las Vegas, NV  89101
Attn:  Ronald Smith
Telephone:  (702) 878-4788

Michael Houlahan                                            12,000
2612 Buchanan Street
San Francisco, CA  94115
Telephone:  (626) 535-2724
Facsimile:  (626) 535-2701

Kyle Hansen                                                 12,000
7206 Rockridge Drive
Huntington Beach, CA  92648
Telephone:  (714) 704-1790
Facsimile: (714) 841-8979

TOTAL                                                       2,400,000
<PAGE>

                                   EXHIBIT B
                                   ---------
                    (To Preferred Stock Purchase Agreement)

               Amended and Restated Certificate of Incorporation
               -------------------------------------------------
<PAGE>

                                   EXHIBIT C
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                            Schedule of Exceptions
                            ----------------------

     The following are the exceptions to the representations and warranties of
PETsMART.com, Inc. (the "Company") set forth in Section 3 of the Preferred Stock
Purchase Agreement dated as of May 12, 1999 (the "Agreement") to which this is
an exhibit.  All capitalized terms used and not otherwise defined herein shall
have the meanings given them in the Agreement.  The section numbers below
correspond to the section numbers in the Agreement.  Anything disclosed under a
section specified below that is applicable to any other section is deemed to be
disclosed under the other such sections.

None.
<PAGE>

                                   EXHIBIT D
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                           Investor Rights Agreement
                           -------------------------
<PAGE>

                                   EXHIBIT E
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                               Voting Agreement
                               ----------------
<PAGE>

                                   EXHIBIT F
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                            Compliance Certificate
                            ----------------------
<PAGE>

                                   EXHIBIT G
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                  Opinion of Wilson Sonsini Goodrich & Rosati
                  -------------------------------------------
<PAGE>

                                   EXHIBIT H
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                               License Agreement
                               -----------------
<PAGE>

                                   EXHIBIT I
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                         Strategic Relationship Terms
                         ----------------------------
<PAGE>

                                   EXHIBIT J
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                     Restricted Stock Purchase Agreements
                     ------------------------------------
<PAGE>

                                   EXHIBIT K
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                                   Warrants
                                   --------
<PAGE>

                                   EXHIBIT L
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                                Rodale Warrant
                                --------------
<PAGE>

                                   EXHIBIT M
                                   ---------
                    (To Preferred Stock Purchase Agreement)

                         General Assignment of Assets
                         ----------------------------<PAGE>

                                                                   EXHIBIT 10.19

================================================================================

                              PETsMART.COM, INC.

                  SERIES D PREFERRED STOCK PURCHASE AGREEMENT

                                October 6, 1999

================================================================================
<PAGE>

<TABLE>
<CAPTION>

                               TABLE OF CONTENTS
                                                                            Page

<C>       <S>                                                              <C>
SECTION 1 AUTHORIZATION AND SALE OF COMMON STOCK AND
     PREFERRED STOCK

     1.1   Authorization of Preferred Stock..................................  1
     1.2   Sale and Issuance of the Shares...................................  1
     1.3   Separate Agreements...............................................  1

SECTION 2 CLOSING DATE; DELIVERY.............................................  2

     2.1   Closing Date......................................................  2
     2.2   Delivery and Payment..............................................  2
     2.3   Subsequent Sale of Preferred Stock................................  2

SECTION 3 REPRESENTATIONS AND WARRANTIES OF THE COMPANY......................  2

     3.1   Organization and Standing; Certificate of Incorporation and Bylaws  3
     3.2   Corporate Power...................................................  3
     3.3   Subsidiaries......................................................  3
     3.4   Capitalization....................................................  3
     3.5   Authorization.....................................................  3
     3.6   Proprietary Rights................................................  4
     3.7   Registration Rights...............................................  4
     3.8   Governmental Consent, etc.........................................  5
     3.9   Offering..........................................................  5
     3.10  Permits...........................................................  5
     3.11  Compliance with Other Instruments.................................  5

SECTION 4 REPRESENTATIONS AND WARRANTIES OF THE PURCHASERS...................  6

     4.1   Business and Financial Experience.................................  6
     4.2   Investment Intent; Blue Sky.......................................  6
     4.3   Rule 144..........................................................  6
     4.4   No Public Market..................................................  6
     4.5   Restrictions on Transfer; Restrictive Legends.....................  6
     4.6   Access to Data....................................................  7
     4.7   Authorization.....................................................  7
     4.8   Brokers or Finders................................................  7
     4.9   Tax Liability.....................................................  7
     4.10  Limited Operating History.........................................  7

SECTION 5 CONDITIONS TO CLOSING OF THE PURCHASERS............................  7

     5.1   Representations and Warranties Correct............................  8
     5.2   Covenants.........................................................  8
     5.3   Blue Sky..........................................................  8
     5.4   Certificate.......................................................  8
     5.5   Amended and Restated Investor Rights Agreement....................  8
</TABLE>

                                      -i-
<PAGE>

<TABLE>

<S>        <C>                                                              <C>
     5.6   Amended and Restated Voting Agreement.............................  8
     5.7   Compliance Certificate............................................  8
     5.8   Board of Directors................................................  8
     5.9   Legal Opinion.....................................................  8
     5.10  Investment........................................................  8

SECTION 6 CONDITIONS TO CLOSING OF THE COMPANY...............................  8

     6.1   Representations and Warranties Correct............................  9
     6.2   Covenants.........................................................  9
     6.3   Certificate.......................................................  9
     6.4   Amended and Restated Investor Rights Agreement....................  9
     6.5   Amended and Restated Voting Agreement.............................  9

SECTION 7 MISCELLANEOUS......................................................  9

     7.1   Governing Law.....................................................  9
     7.2   Entire Agreement; Amendment.......................................  9
     7.3   Notices, etc......................................................  9
     7.4   Delays or Omissions............................................... 10
     7.5   Counterparts...................................................... 10
     7.6   Severability...................................................... 10
     7.7   Titles and Subtitles.............................................. 11
     7.8   Survival of Warranties............................................ 11
     7.9   Successors and Assigns............................................ 11
     7.10  Further Assurances................................................ 11
</TABLE>

                                     -ii-
<PAGE>

                              PETsMART.COM, INC.

                 SERIES  D PREFERRED STOCK PURCHASE AGREEMENT
                 --------------------------------------------

     This Series D Preferred Stock Purchase Agreement (this "Agreement") is made
as of October 6, 1999, by and among PETsMART.com, Inc., a Delaware corporation
(the "Company") and the purchasers of the Company's Series D Preferred Stock who
are signatories to this Agreement (the "Purchasers").  The Purchasers are listed
on Exhibit A hereto.
   ---------

                                   AGREEMENT

     In consideration of the mutual promises and covenants herein, the receipt
and sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

          AUTHORIZATION AND SALE OF COMMON STOCK AND PREFERRED STOCK

     1.1  Authorization of Preferred Stock.  The Company has authorized the
          --------------------------------
sale and issuance to the Purchasers of up to (a) 10,707,561 shares of its Series
D Preferred Stock, par value $0.001 per share (the "Series D Preferred" or the
"Shares"), having the rights, preferences, privileges and restrictions as set
forth in the Amended and Restated Certificate of Incorporation in substantially
the form attached hereto as Exhibit B (the "Certificate").
                            ---------

     1.2  Sale and Issuance of the Shares.  Subject to the terms and conditions
          -------------------------------
hereof, the Company will severally issue and sell:

          (a) to the Purchasers and the Purchasers will buy from the Company up
to 10,707,561 shares at a per share purchase price of $4.67 (the "Per Share
Price"), and at the aggregate purchase price of up to $50,004,310, in the amount
of shares specified opposite the name of the Purchasers in the column designated
"Number of Shares" on Exhibit A.
                      ---------

     1.3  Separate Agreements.  The Company's agreement with each of the
          -------------------
Purchasers hereunder is a separate agreement, the obligations of each of the
Purchasers hereunder are several and not joint, and the sale of the Shares to
each of the Purchasers is a separate transaction.

                                      -1-
<PAGE>

                                   SECTION 2

                            CLOSING DATE; DELIVERY

     2.1  Closing Date.  It is anticipated that purchase and sale of the Shares
          ------------
hereunder shall be consummated at a closing (the" Closing") held at the offices
of Strategic Law Partners, LLP, 333 South Grand Avenue, Suite 3950, Los Angeles,
California 90071 on October ___, 1999, at 4:00 p.m., local time, or at such
other date, time and place upon which the Company and the Purchasers shall agree
(the date and time of the Closing is hereinafter referred to as the "Closing
Date").

     2.2  Delivery and Payment.  At the Closing, the Company will deliver to
          --------------------
each Purchaser a certificate or certificates, registered in the Purchaser's
name, representing the number of Shares to be purchased by the Purchaser at the
Closing, against payment of the purchase price therefor, by (i) check payable to
the Company, (ii) by wire transfer per the Company's instructions, (iii) by any
combination of (i) and (ii) above except that with respect to idealab! Holdings,
LLC ("idealab!") one half by check or wire transfer and one half by delivery of
a 90 day promissory note, substantially in the form attached hereto as Exhibit X
hereto (the "Note"), secured by the Shares to be purchased by idealab! pursuant
to the terms of a Security Agreement substantially in the form of Exhibit Y
hereto (the "Security Agreement") and with respect to each of Global Retail
Partners, L.P., DLJ Diversified Partners, L.P., DLJ Diversified Partners-A,
L.P., GRP Partners, L.P., Global Retail Partners Funding, Inc. and DLJ ESC II
L.P. $.001 per share by check at the Closing with the balance of the purchase
price by wire transfer on or before October 13, 1999.

     2.3  Subsequent Sale of Preferred Stock.  If less than all of the
          ----------------------------------
authorized number of shares of Series D Preferred Stock are sold at the Closing,
then, subject to the terms and conditions of this Agreement, the Company may
sell up to the balance of the authorized but unissued shares of Series D
Preferred Stock to such persons as the Board of Directors of the Company may
determine at the same Per Share Price as the Shares sold at the Closing for a
period of up to 30 days from the Closing.  Any such sale shall be made upon the
same terms and conditions as those contained herein, and such persons or
entities shall become parties to this Agreement, the Amended and Restated Voting
Agreement and the Amended and Restated Investor Rights Agreement (each as
defined herein), and shall have the rights and obligations of a Purchaser
hereunder or thereunder.

                                   SECTION 3

                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     Except as set forth on the Schedule of Exceptions (the "Schedule of
Exceptions") attached hereto as Exhibit C, the Company represents and warrants
                                ---------
to the Purchasers that, as of the Closing Date at which the Purchasers
consummate their purchase of Shares hereunder:

                                      -2-
<PAGE>

     3.1  Organization and Standing; Certificate of Incorporation and Bylaws.
          ------------------------------------------------------------------
The Company is a corporation duly organized and validly existing under, and by
virtue of, the laws of the State of Delaware and is in good standing under such
laws.  The Company has requisite corporate power and authority to own and
operate its properties and assets and to carry on its business as presently
conducted and as proposed to be conducted.  The Company is presently qualified
to do business as a foreign corporation in California and there is no other
jurisdiction in which the failure to be so qualified would have a material
adverse effect on the business or financial condition of the Company.  The
Company has made available to counsel for the Purchasers copies of its
Certificate and Bylaws.  Said copies are true, correct and complete and reflect
all amendments now in effect.

     3.2  Corporate Power.  The Company has all requisite legal and corporate
          ---------------
power and authority to execute and deliver this Agreement, the Amended and
Restated Investor Rights Agreement in substantially the form attached hereto as

Exhibit D (the "Amended and Restated Investor Rights Agreement"), the Amended
---------
and Restated Voting Agreement in substantially the form attached hereto as
Exhibit E (the "Voting Agreement" and, together with this Agreement and the
---------
Investor Rights Agreement, the "Investment Agreements"), to sell and issue the
Shares hereunder, to issue the underlying Common Stock (the "Conversion Stock")
in accordance with the provisions of the Certificate, and to carry out and
perform its obligations under the terms of the Investment Agreements.

     3.3  Subsidiaries.   Except as provided in the Schedule of Exceptions, the
          ------------
Company has no subsidiaries or affiliated companies and does not otherwise own
or control, directly or indirectly, any equity interest in any corporation,
association or business entity.

     3.4  Capitalization.  The authorized capital stock of the Company will,
          --------------
upon the filing of the Certificate, consist of 70,000,000 shares of Common Stock
and 19,769,648 shares of Preferred Stock, 3,300,000 of which have been
designated Series A Preferred, 1,800,000 of which have been designated Series B
Preferred Stock, 2,805,770 of which have been designated Series C Preferred
Stock and 11,863,878 shares of which  have been designated Series  D Preferred
Stock.  The Company has an aggregate of 5,466,464 shares of Common Stock
reserved for issuance under its 1999 Stock Plan (giving effect to an amendment
to the 1999 Stock Plan increasing the number of shares reserved thereunder by
2,275,000 which will be effective as of the Closing Date).  Of the shares of
Common Stock reserved for issuance under the 1999 Stock Plan, options to
purchase 1,286,673 shares of Common Stock have been granted.  As of the Closing
Date, the number of outstanding shares of the Company's capital stock is as set
forth on Section 3.4 of the Schedule of Exceptions.  Except as set forth above
         -----------
or in Section 3.4 of the Schedule of Exceptions, there are no options, warrants
or other rights to purchase or acquire any of the Company's authorized and
unissued capital stock.

     3.5  Authorization.  All corporate action on the part of the Company and
          -------------
its directors necessary for the authorization, execution, delivery and
performance of the Investment Agreements by the Company, the authorization,
sale, issuance and delivery of the Shares and the Conversion Stock and the
performance of the Company's obligations under the Investment Agreements has
been taken or will be taken prior to the Closing.  The Investment Agreements,
when executed and

                                      -3-
<PAGE>

delivered by the Company, shall constitute valid and binding obligations of the
Company, enforceable in accordance with their terms, subject to laws of general
application relating to bankruptcy, insolvency and the relief of debtors and
rules of law governing specific performance, injunctive relief or other
equitable remedies; provided, however, that the Company makes no representation
                    --------  -------
as to the enforceability of the indemnification provisions contained in the
Amended and Restated Investor Rights Agreement. The Shares, when issued in
compliance with the provisions of this Agreement, will be validly issued, fully
paid and nonassessable, and will have the rights, preferences, privileges and
restrictions described in the Certificate; the Common Stock issuable upon
conversion of the Shares has been duly and validly reserved and, when issued in
compliance with the provisions of the Certificate, will be validly issued, fully
paid and nonassessable; and the Shares and the Conversion Stock will be free of
any liens or encumbrances (assuming the Purchaser takes the Shares with no
notice thereof) other than any liens or encumbrances created by or imposed upon
the holders; provided, however, that the Shares and the Conversion Stock may be
subject to restrictions on transfer under state or federal securities laws and
restrictions set forth in the Investor Rights Agreement. The issuance of the
Shares is not subject to any preemptive rights or rights of first refusal which
have not been complied with or waived.

     3.6  Proprietary Rights.  The Company has title and ownership of, or full
          ------------------
right to use, all patents, trademarks, service marks, trade names, copyrights,
trade secrets, information, proprietary rights and processes necessary for its
business as now conducted and, to the Company's knowledge, without any conflict
with or infringement of the rights of others.  Other than licenses for off-the-
shelf software, or as set forth on Section 3.6 of the Schedule of Exceptions,
                                   -----------
there are no material options, licenses, or agreements of any kind relating to
the foregoing, nor is the Company bound by or a party to any options, licenses
or agreements of any kind with respect to the patents, trademarks, service
marks, trade names, copyrights, trade secrets, licenses, information,
proprietary rights and processes of any other person or entity.  The Company has
not received any communications alleging that the Company has violated or, by
conducting its business as currently conducted, would violate any of the
patents, trademarks, service marks, trade names, copyrights or trade proprietary
rights of any other person or entity.  To the knowledge of the Company, none of
its employees is obligated under any contract (including licenses, covenants or
commitments of any nature) or other agreement, or subject to any judgment,
decree or order of any court or administrative agency, that would interfere with
the use of his or her best efforts to promote the interests of the Company or
that would conflict with the Company's business as currently conducted.  Neither
the execution and delivery of the Investment Agreements, nor the carrying on of
the Company's business by the employees of the Company, nor the conduct of the
Company's business as currently conducted, will, to the Company's knowledge,
conflict with or result in a breach of the terms, conditions or provisions of,
or constitute a default under, any contract, covenant or instrument under which
any of such employees is now obligated.  The Company does not believe it is or
will be necessary to utilize any inventions of any of its employees (or people
it currently intends to hire) made prior to their employment by the Company.

     3.7  Registration Rights.  Except as set forth in the Amended and Restated
          -------------------
Investor Rights Agreement, the Company is not under any contractual obligation
to register under the

                                      -4-
<PAGE>

Securities Act of 1933, as amended (the "Securities Act"), any of its presently
outstanding securities or any of its securities which may hereafter be issued.

     3.8  Governmental Consent, etc.  No consent, approval order or
          -------------------------
authorization of or registration, qualification, designation, declaration or
filing with any governmental authority on the part of the Company is required in
connection with the valid execution and delivery of the Investment Agreements,
or the offer, sale or issuance of the Shares or the Conversion Stock, or the
consummation of any other transaction contemplated hereby, except (i) the filing
of the Certificate in the office of the Delaware Secretary of State prior to the
Closing and (ii) the qualification (or taking of such action as may be necessary
to secure an exemption from qualification, if available) of the offer and sale
of the Shares and the Conversion Stock under applicable Blue Sky laws, which
filings and qualifications, if required, will be accomplished in a timely
manner.

     3.9  Offering.  Subject to the accuracy of the Purchaser's representations
          --------
in Section 4 hereof, the offer, sale and issuance of the Shares and the
Conversion Stock constitute transactions exempt from the registration
requirements of Section 5 of the Securities Act.

     3.10 Permits.  The Company has all franchises, permits, licenses, and any
          -------
similar authority necessary for the conduct of its business as now being
conducted by it, the lack of which could materially and adversely affect the
business, properties, or financial condition of the Company, and the Company
believes it can obtain, without undue burden or expense, any similar authority
for the conduct of its business as planned to be conducted.  To its knowledge,
the Company is not in default in any material respect under any of such
franchises, permits, licenses, or other similar authority.

     3.11 Compliance with Other Instruments.  The Company is not in violation of
          ---------------------------------
any term of the Certificate or Bylaws, or in any respect of any term or
provision of any mortgage, indenture, contract, agreement, instrument, judgment
or decree, and to its knowledge, is not in violation of any order, statute, rule
or regulation applicable to the Company, which violation reasonably would be
expected to have a material adverse effect on the Company's business.  The
execution, delivery and performance of and compliance with this Agreement, and
the other Investment Agreements and the consummation of the transactions
contemplated hereby and thereby, and the issuance of the Shares and the
Conversion Shares, have not resulted and will not result in any violation of, or
conflict with, or constitute a default under any such term or provision, or
result in the creation of, any mortgage, pledge, lien, encumbrance or charge
upon any of the properties or assets of the Company; and there is no such
violation or default or event which, with the passage of time or giving of
notice or both, would constitute a violation or default which would materially
and adversely affect the business of the Company or any of its properties or
assets.

                                      -5-
<PAGE>

                                   SECTION 4

               REPRESENTATIONS AND WARRANTIES OF THE PURCHASERS

     Each Purchaser hereby severally (and not jointly) represents and warrants
to the Company as follows:

     4.1  Business and Financial Experience.  It is an accredited investor
          ---------------------------------
within the meaning of Rule 501 of Regulation D promulgated under the Securities
Act.  Its knowledge and experience in financial and business matters are such
that its is capable of evaluating the merits and risks of its purchase of the
Shares and the underlying Conversion Stock as contemplated by this Agreement.
Its financial situation is such that it can afford to bear the economic risk of
holding the Shares and the underlying Conversion Stock for an indefinite period
of time and suffer complete loss of its investment.

     4.2  Investment Intent; Blue Sky.  It is acquiring the Shares and the
          ---------------------------
underlying Conversion Stock for investment for its own account, not as a nominee
or agent, and not with a view to, or for resale in connection with, any
distribution thereof.  It understands that the issuance of the Shares and the
underlying Conversion Stock has not been, and will not be, registered under the
Securities Act by reason of a specific exemption from the registration
provisions of the Securities Act, the availability of which depends upon, among
other things, the bona fide nature of the Purchaser's investment intent and the
accuracy of the Purchaser's representations as expressed herein.  The
Purchaser's address set forth on the Schedule of Purchasers attached hereto as
Exhibit A represents the Purchaser's true and correct state of domicile, upon
---------
which the Company may rely for the purpose of complying with applicable Blue Sky
laws.

     4.3  Rule 144.  It acknowledges that the Shares and the underlying
          --------
Conversion Stock must be held indefinitely unless subsequently registered under
the Securities Act or unless an exemption from such registration is available.
It is aware of the provisions of Rule 144 promulgated under the Securities Act
which permit limited resale of shares purchased in a private placement subject
to the satisfaction of certain conditions, including, among other things, the
existence of a public market for the shares, the availability of certain current
public information about the Company, the resale occurring not less than one
year after a party has purchased and paid for the security to be sold, the sale
being effected through a "broker's transaction" or in a transaction directly
with a "market maker," and the number of shares being sold during any three-
month period not exceeding specified limitations.

     4.4  No Public Market.  It understands that no public market now exists for
          ----------------
any of the securities issued by the Company and that the Company has made no
assurances that a public market will ever exist for the Company's securities.

     4.5  Restrictions on Transfer; Restrictive Legends.  It understands that
          ---------------------------------------------
the transfer of the Shares and the Conversion Stock, if applicable, is
restricted by applicable state and Federal

                                      -6-
<PAGE>

securities laws and by the provisions of the Amended and Restated Investor
Rights Agreement and the Amended and Restated Voting Agreement, and that the
certificates representing the Shares and the Conversion Stock will be imprinted
with legends restricting transfer except in compliance therewith.

     4.6  Access to Data.  It has had an opportunity to discuss the Company's
          --------------
business, management and financial affairs with the Company's management.  It
has also had an opportunity to ask questions of officers of the Company.  It
understands that such discussions, as well as any written information issued by
the Company, were intended to describe the material aspects of the Company's
business and prospects but were not a thorough or exhaustive description.

     4.7  Authorization.  All action on the part of the Purchaser's partners,
          -------------
board of directors, members and stockholders, as applicable, necessary for the
authorization, execution, delivery and performance of the Investment Agreements
by the Purchaser, the purchase of and payment for the Shares and the Conversion
Stock, if applicable, and the performance of all of the Purchaser's obligations
under the Investment Agreements has been taken or will be taken prior to the
Closing.  The Investment Agreements, when executed and delivered by the
Purchaser, shall constitute valid and binding obligations of the Purchaser,
enforceable in accordance with their terms, subject to laws of general
application relating to bankruptcy, insolvency and the relief of debtors and
rules of law governing specific performance, injunctive relief or other
equitable remedies; provided, however, that the Purchaser makes no
representation as to the enforceability of the indemnification provisions
contained in the Amended and Restated Investor Rights Agreement.

     4.8  Brokers or Finders.  The Company has not and will not incur, directly
          ------------------
or indirectly, as a result of any action taken by the Purchaser, any liability
for brokerage or finders' fees or agents' commissions or any similar charges in
connection with this Agreement or the transactions contemplated hereby.

     4.9  Tax Liability.  It has reviewed with its own tax advisors the tax
          -------------
consequences of the transactions contemplated by this Agreement. It relies
solely on such advisors and not on any statements or representations of the
Company or any of the Company's agents with respect to such tax consequences.
It understands that it, and not the Company, shall be responsible for its own
tax liability that may arise as a result of the transactions contemplated by
this Agreement.

     4.10 Limited Operating History.  It acknowledges that the Company was
          -------------------------
incorporated on May 6, 1999 and has a limited operating history.

                                   SECTION 5

                    CONDITIONS TO CLOSING OF THE PURCHASERS

     Each Purchaser's obligation to purchase the Shares is, unless waived in
writing by the Purchaser, subject to the fulfillment as of the date of Closing
of the following conditions:

                                      -7-
<PAGE>

     5.1  Representations and Warranties Correct.  The representations and
          --------------------------------------
warranties made in Section 3 hereof by the Company shall be true and correct in
all material respects as of the date of the Closing.

     5.2  Covenants.  All covenants, agreements and conditions contained in this
          ---------
Agreement to be performed or complied with by the Company on or prior to the
Closing Date shall have been performed or complied with in all material
respects.

     5.3  Blue Sky.  The Company shall have obtained all necessary Blue Sky law
          --------
permits and qualifications, or have the availability of exemptions therefrom,
required by any state for the offer and sale of the Shares and the underlying
Conversion Stock.

     5.4  Certificate.  The Certificate shall have been properly filed in the
          -----------
office of the Delaware Secretary of State.

     5.5  Amended and Restated Investor Rights Agreement.  The Company shall
          ----------------------------------------------
have executed and delivered the Amended and Restated Investor Rights Agreement
in substantially the form attached hereto as Exhibit D.
                                             ---------

     5.6  Amended and Restated Voting Agreement.  The Company and each of the
          -------------------------------------
Purchasers shall have executed and delivered the Amended and Restated Voting
Agreement in substantially the form attached hereto as Exhibit E.
                                                       ----------

     5.7  Compliance Certificate.  The Company shall have delivered to the
          ----------------------
Purchasers a certificate of the Company executed by the President of the
Company, dated as of the date of the Closing and certifying to the fulfillment
of the conditions specified in Sections 5.1 and 5.2 of this Agreement.

     5.8  Board of Directors.  Upon the Closing, the number of directors
          ------------------
constituting the Board of Directors shall continue to be seven (7) and shall
continue to consist of Bill Gross, Robert Kavner, Tom McGovern, Yves Sisteron,
Samuel J. Parker (or successor thereto), Philip L. Francis and Neil Watanabe.

     5.9  Legal Opinion.  The Purchasers shall have received an opinion of
          -------------
Strategic Law Partners, LLP, counsel to the Company, in substantially the form
attached hereto as Exhibit F.
                   ---------

     5.10 Investment.  Purchasers shall have tendered, in the aggregate, at the
          ----------
Closing, consideration of not less than $25,000,000.

                                   SECTION 6

                     CONDITIONS TO CLOSING OF THE COMPANY

     The Company's obligation to sell and issue the Shares is, unless waived in
writing by the Company, subject to the fulfillment as of the date of Closing of
the following conditions:

                                      -8-
<PAGE>

     6.1  Representations and Warranties Correct.  The representations and
          --------------------------------------
warranties made in Section 4 hereof by the Purchasers shall be true and correct
in all material respects as of the date of the Closing.

     6.2  Covenants.  All covenants, agreements, and conditions contained in
          ---------
this Agreement to be performed or complied with by the Purchasers on or prior to
the Closing Date shall have been performed or complied with in all material
respects.

     6.3  Certificate.  The Certificate shall have been filed in the office of
          -----------
the Delaware Secretary of State.

     6.4  Amended and Restated Investor Rights Agreement.  The Purchasers shall
          ----------------------------------------------
have executed and delivered the Amended and Restated Investor Rights Agreement
in substantially the form attached hereto as Exhibit D.
                                             ---------

     6.5  Amended and Restated Voting Agreement.  The Purchasers shall have
          -------------------------------------
executed and delivered the Amended and Restated Voting Agreement in
substantially the form attached hereto as Exhibit E.
                                          ---------

                                   SECTION 7

                                 MISCELLANEOUS

     7.1  Governing Law.  This Agreement shall be governed in all respects by
          -------------
the internal laws of the State of California without regard to conflict of laws
provisions.

     7.2  Entire Agreement; Amendment.  This Agreement, the Amended and Restated
          ---------------------------
Investor Rights Agreement, the Amended and Restated Voting Agreement and the
other documents delivered pursuant hereto, including the exhibits hereto,
constitute the full and entire understanding and agreement among the parties
with regard to the subjects hereof and thereof, and no party shall be liable or
bound to any other party in any manner by any warranties, representations or
covenants except as specifically set forth herein or therein.  Except as
expressly provided herein, neither this Agreement nor any term hereof may be
amended, waived, discharged or terminated other than by a written instrument
signed by the party against whom enforcement of any such amendment, waiver,
discharge or termination is sought.

     7.3  Notices, etc.  All notices and other communications required or
          ------------
permitted hereunder shall be in writing and shall be mailed by registered or
certified mail, postage prepaid, or otherwise delivered by facsimile
transmission, by hand or by messenger, addressed:

          (a) if to a Purchaser, to the address or fax number listed after such
Purchaser's name on the Schedule of Purchasers attached hereto as Exhibit A or
                                                                  ---------
at such other address as such Purchaser shall have furnished to the Company.

                                      -9-
<PAGE>

          (b)  if to the Company, to:

               PETsMART.com, Inc.
               130 West Union Street
               Pasadena, CA 91103
               Attn:  Tom McGovern
               Fax:  (626) 535-2701

or at such other address as the Company shall have furnished to the Purchasers,
with a copy to:

               Strategic Law Partners, LLP
               333 South Grand Avenue, Suite 3950
               Los Angeles, California 90071
               Attn:  Bradley D. Schwartz, Esq.
               Fax:  (213) 621-0982

     Each such notice or other communication shall for all purposes of this
Agreement be treated as effective or having been given when received if
delivered personally, if sent by facsimile, the first business day after the
date of confirmation that the facsimile has been successfully transmitted to the
facsimile number for the party notified, or, if sent by mail, at the earlier of
its receipt or 72 hours after the same has been deposited in a regularly
maintained receptacle for the deposit of the United States mail, addressed and
mailed as aforesaid.

     7.4  Delays or Omissions.  Except as expressly provided herein, no delay or
          -------------------
omission to exercise any right, power or remedy accruing to any party, upon any
breach or default of another party under this Agreement, shall impair any such
right, power or remedy of such party nor shall it be construed to be a waiver of
any such breach or default, or an acquiescence therein, or of any similar breach
or default thereafter occurring; nor shall any waiver of any single breach or
default be deemed a waiver of any other breach or default theretofore or
thereafter occurring. Any waiver, permit, consent or approval of any kind or
character on the part of any party of any breach or default under this
Agreement, or any waiver on the part of any party of any provisions or
conditions of this Agreement, must be in writing and shall be effective only to
the extent specifically set forth in such writing.  All remedies, either under
this Agreement or by law or otherwise afforded to any party, shall be cumulative
and not alternative.

     7.5  Counterparts.  This Agreement may be executed in any number of
          ------------
counterparts, each of which shall be an original, and all of which together
shall constitute one instrument.

     7.6  Severability.  In the event that any provision of this Agreement
          ------------
becomes or is declared by a court of competent jurisdiction to be illegal,
unenforceable or void, this Agreement shall continue in full force and effect
without said provision, which shall be replaced with an enforceable provision
closest in intent and economic effect as the severed provision; provided that no

                                     -10-
<PAGE>

such severability shall be effective if it materially changes the economic
benefit of this Agreement to any party.

     7.7  Titles and Subtitles.  The titles and subtitles used in this Agreement
          --------------------
are used for convenience only and are not to be considered in construing or
interpreting this Agreement.

     7.8  Survival of Warranties.  The warranties, representations and covenants
          ----------------------
of the Company and the Purchasers contained in or made pursuant to this
Agreement shall survive execution and delivery of this Agreement and the Closing
for a period of one hundred eighty (180) days and shall in no way be affected by
any investigation of the subject matter thereof made by or on behalf of the
Purchasers or the Company.

     7.9  Successors and Assigns.  Except as otherwise expressly provided
          ----------------------
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the successors, permitted assigns, heirs, executors and administrators of
the parties hereto.

     7.10 Further Assurances.  Each party hereto agrees to do all acts and
          ------------------
things, and to make, execute and delivery such written instruments, as shall
from time to time be reasonably required to carry out the terms and provisions
of this Agreement.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                     -11-
<PAGE>

     The foregoing agreement is hereby executed effective as of the date first
set forth above.

"COMPANY"

PETsMART.COM, INC.

   /s/  Tom McGovern, Jr.
-----------------------------------
Tom McGovern, Jr.
President

"PURCHASERS"

PETsMART, INC.

 /s/ Philip L. Francis
------------------------------------
Philip L. Francis
President and Chief Executive Officer

IDEALAB! CAPITAL PARTNERS I-A, L.P.

 /s/ William S. Elkus
------------------------------------
William S. Elkus,
Managing Member, idealab! Capital Management, I, LLC,
General Partner of idealab! Capital Partners I-A, L.P.

IDEALAB! CAPITAL PARTNERS I-B, L.P.

/s/ William S. Elkus
-----------------------------------
William S. Elkus,
Managing Member, idealab! Capital Management, I, LLC,
General Partner of idealab! Capital Partners I-B, L.P.
<PAGE>

SIMBA, LLC

By: /s/ Carina Schaldach
   -------------------------
Name:  Carina Schaldach
     -----------------------
Title:
      ----------------------

WS INVESTMENT COMPANY  99B

By: /s/ Martin W. Korman
   -------------------------
Name:  Martin W. Korman
     -----------------------
Title: Member
      ----------------------

 /s/ Larry W. Sonsini
----------------------------
LARRY SONSINI

 /s/ Martin W. Korman
----------------------------
MARTIN W. KORMAN

 /s/ Tom McGovern, Jr.
----------------------------
TOM MCGOVERN, JR.

 /s/ Michael Houlahan
----------------------------
MICHAEL HOULAHAN

GLOBAL RETAIL PARTNERS, L.P.
BY: GLOBAL RETAIL PARTNERS, INC.
     General Partner

By: /s/ Steven E. Lebow
   -------------------------
Name:   Steven E. Lebow
     -----------------------
Title:  Chairman
      ----------------------
<PAGE>

DLJ DIVERSIFIED PARTNERS, L.P.
BY: DLJ DIVERSIFIED PARTNERS, INC.
     General Partner

By: /s/ Steven E. Lebow
   -------------------------
Name:   Steven E. Lebow
     -----------------------
Title:  Chairman
      ----------------------

DLJ DIVERSIFIED PARTNERS-A, L.P.
BY: DLJ DIVERSIFIED PARTNERS, INC.
     General Partner

By: /s/ Steven E. Lebow
   -------------------------
Name:   Steven E. Lebow
     -----------------------
Title:  Chairman
      ----------------------

GRP PARTNERS, L.P.
BY: GLOBAL RETAIL PARTNERS, INC.
     General Partner

By: /s/ Steven E. Lebow
   -------------------------
Name:   Steven E. Lebow
     -----------------------
Title:  Chairman
      ----------------------

GLOBAL RETAIL PARTNERS FUNDING, INC.

By: /s/ Osamu R. Watanabe
   -------------------------
Name:   Osamu R. Watanabe
     -----------------------
Title:  Vice President
      ----------------------
<PAGE>

DLJ ESC II L.P.
BY: DLJ LBO PLANS MANAGEMENT CORPORATION
     General Partner

By: /s/ Osamu R. Watanabe
   -------------------------
Name:   Osamu R. Watanabe
     -----------------------
Title:  Vice President
      ----------------------

IDEALAB! HOLDINGS, L.L.C.

By: /s/ Marcia Goodstein
   -------------------------
Name:  Marcia Goodstein
     -----------------------
Title: Secretary
      ----------------------

 /s/ Bradley D. Schwartz
----------------------------
BRADLEY D. SCHWARTZ

 /s/ James K. Baer
----------------------------
JAMES K. BAER

BIG DOG USA, INC.

By: /s/ Andrew Feshbach
   -------------------------
Name:  Andrew Feshbach
     -----------------------
Title: CEO
      ----------------------

 /s/ Andrew Feshbach
----------------------------
ANDREW FESHBACH
<PAGE>

 /s/ Anthony Wall
----------------------------
ANTHONY WALL

 /s/ Andrew Wadhams
----------------------------
ANDREW WADHAMS

 /s/ Douglas Nilsen
----------------------------
DOUGLAS NILSEN

 /s/ Roberta Morris
----------------------------
ROBERTA MORRIS

 /s/ Jeffrey Cowen
----------------------------
JEFFREY COWEN

 /s/ David Wolf
----------------------------
DAVID WOLF

 /s/ Siska Buitenman
----------------------------
SISKA BUITENMAN

SK PRIVATE INVESTMENT FUND-SERIES B

By: /s/ Thomas H. Kennedy
   ---------------------------------------
Name:  Thomas H. Kennedy
     -------------------------------------
Title: Member, Investment Committee Member
      ------------------------------------
<PAGE>

                                   EXHIBIT A
                                   ---------
               (To Series D Preferred Stock Purchase Agreement)

                        Schedule of Series D Purchasers
                        -------------------------------

Series D Stock Purchaser            Number of Series D Shares
------------------------            -------------------------

PETsMART, Inc.                              5,287,135
19601 N. 27/th/ Avenue
Phoenix, AZ 85027
Attn: Philip L. Francis
Phone: (623) 580-6100
Fax: (623) 580-6513

With a copy to:
--------------
Cooley Godward, L.L.P.
Five Palo Alto Square
300 El Camino Real
Palo Alto, CA 94306-2155
Attn: Bob Brigham, Esq.

Idealab! Capital Partners I-A, L.P.         205,401
130 West Union Street
Pasadena, CA 91103
Attn: William Elkus
Phone: (626) 535-2882
Fax: (626) 535-2881

Idealab! Capital Partners I-B, L.P.         1,078,352
130 West Union Street
Pasadena, CA 91103
Attn: William Elkus
Phone: (626) 535-2882
Fax: (626) 535-2881

Simba, LLC                                  22,268
130 West Union Street
Pasadena, CA 91103
Attn: Carina Schaldach
Phone: (626) 535-2831
Fax: (626) 535-2701
<PAGE>

WS Investment Company 99B                   3,202
650 Page Mill Road
Palo Alto, CA 94303
Attn: Jim Terranova
Phone: (650) 493-9300
Fax: (650) 493-6811

Larry Sonsini                               1,067
650 Page Mill Road
Palo Alto, CA 94303
Phone: (650) 493-9300
Fax: (650) 493-6811

Martin W. Korman                            1,067
650 Page Mill Road
Palo Alto, CA 94303
Phone: (650) 493-9300
Fax: (650) 493-6811

Tom McGovern, Jr.                           6,356
130 West Union Street
Pasadena, CA 91103
Phone: (626) 535-2735
Fax: (626) 535-2701

Michael Houlahan                            4,242
130 West Union Street
Pasadena, CA 91103
Phone: (626) 535-2735
Fax: (626) 535-2701

Global Retail Partners, L.P.                686,445
277 Park Avenue, 19/th/ Floor
New York, NY 10172
Attn: Nicole Arnaboldi
Phone: (212) 892-3000
Fax: (212) 892-7552
<PAGE>

With a copy to:
--------------
Global Retail Partners, L.P.
2121 Avenue of the Stars, 30/th/ Floor
Los Angeles, CA 90067
Attn: Osamu Watanabe
Phone: (310) 282-6100
Fax: (310) 282-6178

DLJ Diversified Partners, L.P.              204,551
277 Park Avenue, 19/th/ Floor
New York, NY 10172
Attn: Nicole Arnaboldi
Phone: (212) 892-3000
Fax: (212) 892-7552

With a  copy to:
---------------
DLJ Diversified Partners, L.P.
277 Park Avenue, 23/th/ Floor
New York, NY 10172
Attn: Ivy Dodes
Phone: (212) 892-3000
Fax: (212) 892-2689

DLJ Diversified Partners-A, L.P.            75,960
277 Park Avenue, 19/th/ Floor
New York, NY 10172
Attn: Nicole Arnaboldi
Phone: (212) 892-3000
Fax: (212) 892-7552

With a  copy to:
---------------
DLJ Diversified Partners-A, L.P.
277 Park Avenue, 23/th/ Floor
New York, NY 10172
Attn: Ivy Dodes
Phone: (212) 892-3000
Fax: (212) 892-2689
<PAGE>

GRP Partners, L.P.                          44,625
277 Park Avenue, 19/th/ Floor
New York, NY 10172
Attn: Nicole Arnaboldi
Phone: (212) 892-3000
Fax: (212) 892-7552

With a copy to:
--------------
GRP Partners, L.P.
2121 Avenue of the Stars, 30/th/ Floor
Los Angeles, CA 90067
Attn: Osamu Watanabe
Phone: (310) 282-6100
Fax: (310) 282-6178

Global Retail Partners Funding, Inc.        1,576,355
277 Park Avenue, 19/th/ Floor
New York, NY 10172
Attn: Nicole Arnaboldi
Phone: (212) 892-3000
Fax: (212) 892-7552

With a copy to:
--------------
Global Retail Partners Funding, Inc.
2121 Avenue of the Stars, 30/th/ Floor
Los Angeles, CA 90067
Attn: Osamu Watanabe
Phone: (310) 282-6100
Fax: (310) 282-6178

DLJ ESC II L.P.                             11,816
277 Park Avenue, 19/th/ Floor
New York, NY 10172
Attn: Ed Poletti
Phone: (212) 892-3000
Fax: (212) 892-7572

Idealab! Holdings, L.L.C.                   840,260
130 West Union Street
Pasadena, CA 91103
Attn: Marcia Goodstein
Phone: (626) 585-6900
Fax: (626) 535-2701
<PAGE>

Bradley D. Schwartz, Esq.                   3,212
Strategic Law Partners LLP
333 South Grand Avenue, Suite 3950
Los Angeles, CA 90071
Phone: (213) 621-0978
Fax: (213) 621-0982

James K. Baer, Esq.                         2,141
Strategic Law Partners LLP
333 South Grand Avenue, Suite 3950
Los Angeles, CA 90071
Phone: (213) 617-8960
Fax: (213) 617-8961

Big Dog USA, Inc.                           535,331
121 Gray Avenue
Santa Barbara, CA 93101
Attn: General Counsel
Phone: (805) 963-8727
Fax: (805) 962-9460

Andrew Feshbach                             21,414
C/O Big Dog USA, Inc.
121 Gray Avenue
Santa Barbara, CA 93101
Phone: (805) 963-8727
Fax: (805) 962-9460

Anthony Wall                                12,848
C/O Big Dog USA, Inc.
121 Gray Avenue
Santa Barbara, CA 93101
Phone: (805) 963-8727
Fax: (805) 962-9460

Andrew Wadhams                              12,848
C/O Big Dog USA, Inc.
121 Gray Avenue
Santa Barbara, CA 93101
Phone: (805) 963-8727
Fax: (805) 962-9460
<PAGE>

Douglas Nilsen                              12,848
C/O Big Dog USA, Inc.
121 Gray Avenue
Santa Barbara, CA 93101
Phone: (805) 963-8727
Fax: (805) 962-9460

Roberta Morris                              12,848
C/O Big Dog USA, Inc.
121 Gray Avenue
Santa Barbara, CA 93101
Phone: (805) 963-8727
Fax: (805) 962-9460

Jeffrey Cowen                               10,707
C/O Big Dog USA, Inc.
121 Gray Avenue
Santa Barbara, CA 93101
Phone: (805) 963-8727
Fax: (805) 962-9460

David Wolf                                  12,848
C/O Big Dog USA, Inc.
121 Gray Avenue
Santa Barbara, CA 93101
Phone: (805) 963-8727
Fax: (805) 962-9460

Siska Buitenman                             10,707
C/O Big Dog USA, Inc.
121 Gray Avenue
Santa Barbara, CA 93101
Phone: (805) 963-8727
Fax: (805) 962-9460

SK Private Investment Fund-Series B         10,707
C/O Skadden, Arps, Slate, Meagher & Flom
919 Third Avenue
New York, New York 10022-3897
Attention: Susan Dornfeld
Phone: (212) 735-3133
Fax: (213) 451-7825
<PAGE>

                                   EXHIBIT B
                                   ---------
               (To Series D Preferred Stock Purchase Agreement)

               Amended and Restated Certificate of Incorporation
               -------------------------------------------------
<PAGE>

                                   EXHIBIT C
                                   ---------
               (To Series D Preferred Stock Purchase Agreement)

                            Schedule of Exceptions
                            ----------------------

     The following are the exceptions to the representations and warranties of
PETsMART.com, Inc. (the "Company") set forth in Section 3 of the Series D
Preferred Stock Purchase Agreement dated as of October 6, 1999 (the "Agreement")
to which this is an exhibit. All capitalized terms used and not otherwise
defined herein shall have the meanings given them in the Agreement. The section
numbers below correspond to the section numbers in the Agreement. Anything
disclosed under a section specified below that is applicable to any other
section is deemed to be disclosed under the other such sections.

Section 3.4
-----------

                              Capitalization Table
                              --------------------
<TABLE>
<CAPTION>

Security                                           Outstanding Shares
--------                                          -------------------
<S>                                               <C>
Series A Preferred Stock                          3,000,000 (13,636,364
                                                  on as converted basis)

Series B Preferred Stock                          1,800,000 (1,800,000
                                                  on as converted basis)

Series C Preferred Stock                          2,400,000 (8,556,040
                                                  on as converted basis)

Common Stock                                      2,006,283
</TABLE>

Warrants
--------

PETsMART Series A Warrant dated May 12, 1999 exercisable into 300,000 shares of
Series A Preferred Stock (1,363,636 on as converted basis)

idealab! Series C Warrant dated May 12, 1999 exercisable into 339,278 shares of
Series C Preferred Stock (1,209,532 on as converted basis)

Rodale Series C Warrant dated May 12, 1999 exercisable into 43,227 shares of
Series C Preferred Stock (154,105 on as converted basis)
<PAGE>

Rodale Series C Warrant dated May 12, 1999 exercisable into 23,163 shares of
Series C Preferred stock (82,576 on as converted basis)

Warrant to Purchase Common Stock of PETsMART.com, Inc. dated 8/31/99 exercisable
into 840,000 shares of Common Stock

Warrant to Purchase Common Stock of Big Dog Holdings, Inc. dated 8/31/99
exercisable into 121,000 shares of Common Stock

Other Commitments
-----------------

     In addition, up to 1,156,317 shares of Series D Preferred Stock (the "Acme
Shares") is reserved for issuance in connection with proposed acquisition by the
Company of Digital Communities, Inc. dba Acmepet.com ("Digitial") and may be
issued in accordance with the terms of the Agreement and Plan of Reorganization,
dated as of August 11, 1999, by and among the Company, Digital and certain
stockholders of Digital.

     Each of PETsMART, Inc., idealab! Holdings, LLC and Rodale Press, Inc. have
the right to receive or purchase shares of Common Stock of the Company upon the
occurrence of certain events pursuant to the terms of a letter agreement dated
May 12, 1999 entered into among the Company and such persons.

Section 3.6
-----------

1.   Trademark License Agreement, dated as of May 12, 1999 between PETsMART,
     Inc. and PETsMART.com, Inc.

2.   PETsMART/PETsMART.com, Inc. Strategic Relationship Interim Agreement, dated
     as of May 12, 1999

3.   Strategic Relationship Agreement dated 8/31/99 by and between Big Dog USA,
     Inc., Big Dog Holdings, Inc. and PETsMART.com, Inc.

4.   ECommerce Merchant Agreement dated 8/31/99 by and between Big Dog USA,
     Inc., Big Dog Holdings, Inc. and PETsMART.com, Inc. (Exhibit B to Strategic
     Relationship Agreement)

5.   ECommerce Merchant Agreement dated 8/31/99 by and between Big Dog USA,
     Inc., Big Dog Holdings, Inc. and PETsMART.com, Inc. (Exhibit C to Strategic
     Relationship Agreement)

6.   License Agreement dated 8/31/99 by and between Big Dog Holdings dba Big Dog
     Sportswear, Big Dig USA, Inc. and PETsMART.com, Inc. and PETsMART, Inc.
<PAGE>

                                   EXHIBIT D
                                   ---------
               (To Series D Preferred Stock Purchase Agreement)

                Amended and Restated Investor Rights Agreement
                ----------------------------------------------
<PAGE>

                                   EXHIBIT E
                                   ---------
               (To Series D Preferred Stock Purchase Agreement)

                     Amended and Restated Voting Agreement
                     -------------------------------------
<PAGE>

                                   EXHIBIT F
                                   ---------
               (To Series D Preferred Stock Purchase Agreement)

                    Opinion of Strategic Law Partners, LLP
                    --------------------------------------
<PAGE>

                                   EXHIBIT X
                                   ---------
               (To Series D Preferred Stock Purchase Agreement)

                                Promissory Note
                                ---------------
<PAGE>

                                   EXHIBIT Y
                                   ---------
               (To Series D Preferred Stock Purchase Agreement)

                              Security Agreement
                              ------------------

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00001-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00001-of-00352.parquet"}]]