Document:

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                                                                   Exhibit 10.10

                      RESTRICTED STOCK PURCHASE AGREEMENT

     This Restricted Stock Purchase Agreement (the "Agreement") is made as of
                                                    ---------
April 15, 1999 (the "Purchase Date"), by and between Petopia.com, Inc., a
Delaware corporation (the "Company"), and David Fraze ("Purchaser").
                           -------                      ---------

     1.   Sale of Stock.  Subject to the terms and conditions of this
          -------------
Agreement, on the Purchase Date (as defined below) the Company will issue and
sell to Purchaser, and Purchaser agrees to purchase from the Company, nine
hundred fifty-six thousand two hundred fifty (956,250) Shares (as defined below)
in exchange for cash consideration equal to $74,587.50, or $.078 per purchased
Share.

     The term "Shares" refers to the Shares and all securities received in
replacement of or in connection with the Shares pursuant to stock dividends or
splits, all securities received in replacement of the Shares in a
recapitalization, merger, reorganization, exchange or the like, and all new,
substituted or additional securities or other properties to which Purchaser is
entitled by reason of Purchaser's ownership of the Shares.

     2.   Purchase.  The purchase and sale of the Shares under this Agreement
          --------
shall occur at the principal office of the Company simultaneously with the
execution of this Agreement or at such other time and place as the Company and
Purchaser shall agree (the "Purchase Date"). On the Purchase Date, the
                            -------------
Company will deliver to Purchaser a certificate representing the Shares to be
purchased by Purchaser (which shall be issued in Purchaser's name) against
delivery of the Purchase Price.

     3.   Limitations on Transfer.  In addition to any other limitation on
          -----------------------
transfer created by applicable securities laws, Purchaser shall not assign,
encumber or dispose of any interest in the Shares while the Shares are subject
to the Company's Repurchase Option (as defined below), except as provided below.
After any Shares have been released from the Repurchase Option, Purchaser shall
not assign, encumber or dispose of any interest in such Shares except in
compliance with the provisions below and applicable securities laws.

          (a)  Repurchase Option.
               -----------------

               (i)   In the event of the voluntary or involuntary termination of
Purchaser's employment with the Company for any reason (including death or
disability), with or without cause, the Company shall upon the date of such
termination (the "Termination Date") have an irrevocable, exclusive option (the
                  ----------------
"Repurchase Option") for a period of 60 days from such date to repurchase all or
 -----------------
any portion of the Shares held by Purchaser as of the Termination Date which
have not yet been released from the Company's Repurchase Option at the original
purchase price per Share specified in Section 1 (adjusted for any stock splits,
stock dividends and the like); provided, however, that the Repurchase Option
                               --------  -------
shall continue for a period of up to one year from the Termination Date to the
extent that the Company reasonably determines that such an extension of time is
necessary to prevent the repurchase of Purchaser's Shares from causing other
capital stock of the Company to not qualify as "small business stock" under
Section 1202 of the Internal Revenue Code of 1986, as amended.
<PAGE>

               (ii)  The Repurchase Option shall be exercised by the Company by
written notice to Purchaser or Purchaser's executor and, at the Company's
option, (A) by delivery to Purchaser or Purchaser's executor with such notice of
a check in the amount of the purchase price for the Shares being purchased, or
(B) in the event Purchaser is indebted to the Company, by cancellation by the
Company of an amount of such indebtedness equal to the purchase price for the
Shares being repurchased, or (C) by a combination of (A) and (B) so that the
combined payment and cancellation of indebtedness equals such purchase price.
Upon delivery of such notice and payment of the purchase price in any of the
ways described above, the Company shall become the legal and beneficial owner of
the Shares being repurchased and all rights and interest therein or related
thereto, and the Company shall have the right to transfer to its own name the
number of Shares being repurchased by the Company, without further action by
Purchaser.

               (iii) Subject to Section 3(a)(iv) below, the Repurchase Option
shall be in effect with respect to 60% of the Shares as of the Purchase Date,
with 40% of the Shares not being subject to the Repurchase Option as of the
Purchase Date. The Repurchase Option as to the remaining 60% of the Shares shall
lapse as to 1/36 of such remaining shares on each monthly anniversary of the
closing date of the sale of at least $4,000,000 of the Company's Series A
Preferred Stock (the "Vesting Commencement Date"), until all Shares are released
from the Repurchase Option (provided in each case that Purchaser's employment
with the Company has not been terminated prior to the date of any such release).
Fractional shares shall be rounded to the nearest whole share. Shares as to
which the Repurchase Option has not lapsed are referred to as "Unvested Shares."
                                                               ---------------

               (iv)  For purposes hereunder, a "Merger" shall mean the
completion of a merger or consolidation of the Company in which the Company is
not the survivor or in which greater than 50% of the voting power of the Company
is transferred, or a sale of all or substantially all of the Company's assets or
capital stock, excluding a transaction for the sole purpose of changing the
legal domicile of the Company. In the event that Purchaser's employment with the
Company (or its successor entity) is terminated without Cause (defined below) or
as a result of a Constructive Termination (defined below) at any time after the
consummation of a Merger, the Repurchase Option shall immediately lapse as to
any remaining Unvested Shares. Upon termination of the repurchase rights
described in Section 3(a)(i) a new certificate or certificates representing the
Shares not repurchased shall be issued, on request, without the legend referred
to in Section 6(a)(ii) below and delivered to Purchaser.

               (v)   For purposes of this Agreement, "Cause" for the termination
                                                      -----
of Purchaser's employment with the Company or its successor will exist at any
time after the happening of one or more of the following events: (1) Purchaser's
willful misconduct or material failure in the performance of the duties of his
position with the Company or its successor, including Purchaser's failure to
comply in any material respect with the legal directives of the Company's Chief
Executive Officer or the Board of Directors so long as such directives are not
unreasonably inconsistent with the Purchaser's position and duties, and such
refusal to comply is not remedied within 10 days after receiving written notice
from the Company or its successor, which written notice shall state that failure
to remedy such conduct may result in termination for Cause; or (2) conduct that
materially adversely affects the Company or its successor or is

                                      -2-
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materially detrimental to the reputation of the Founder or of the Company or its
successor, including but not limited to conviction of a felony involving moral
turpitude.

               (vi)  For purposes of this Agreement, "Constructive Termination"
                                                      ------------------------
shall be deemed to occur if (1) there is an adverse change in Purchaser's
position with the Company or its successor causing such position to be of
materially reduced stature or responsibility; (2) a reduction of more than 25%
of Purchaser's base compensation, or (3) Purchaser's refusal to relocate to a
facility or location that is more than fifty (50) miles from Petopia.com, Inc.'s
principal place of business unless such location is within fifty (50) miles from
Founder's residence.

          (b)  Assignment.  The right of the Company to purchase any part of the
               ----------
Shares may be assigned in whole or in part to any stockholder or stockholders of
the Company or other persons or organizations; provided, however, that an
assignee, other than a corporation that is the parent or a 100% owned subsidiary
of the Company, must pay the Company, upon assignment of such right, cash equal
to the difference between the original purchase price and fair market value, if
the original purchase price is less than the fair market value of the Shares
subject to the assignment.

          (c)  Restrictions Binding on Transferees.  All transferees of Shares
               -----------------------------------
or any interest therein will receive and hold such Shares or interest subject to
the provisions of this Agreement, including, insofar as applicable, the
Repurchase Option. Any sale or transfer of the Company's Shares shall be void
unless the provisions of this Agreement are met.

          (d)  Termination of Rights.  The right of first refusal granted the
               ---------------------
Company by Section 3(b) above and the option to repurchase the Shares in the
event of an involuntary transfer granted the Company by Section 3(c) above shall
terminate upon the first sale of Common Stock of the Company to the general
public pursuant to a registration statement filed with and declared effective by
the Securities and Exchange Commission under the Securities Act. Upon
termination of the right of first refusal described in Section 3(b) and the
expiration or exercise of the Repurchase Option, a new certificate or
certificates representing the Shares not repurchased shall be issued, on
request, without the legend referred to in Section 6(a)(ii) below and delivered
to Purchaser.

     4.   Escrow of Unvested Shares.  For purposes of facilitating the
          -------------------------
enforcement of the provisions of Section 3 above, Purchaser agrees, immediately
upon receipt of the certificate(s) for the Shares subject to the Repurchase
Option, to deliver such certificate(s), together with an Assignment Separate
from Certificate in the form attached to this Agreement as Exhibit B executed by
                                                           ---------
Purchaser and by Purchaser's spouse (if required for transfer), in blank, to the
Secretary of the Company, or the Secretary's designee, to hold such
certificate(s) and Assignment Separate from Certificate in escrow and to take
all such actions and to effectuate all such transfers and/or releases as are in
accordance with the terms of this Agreement. Purchaser hereby acknowledges that
the Secretary of the Company, or the Secretary's designee, is so appointed as
the escrow holder with the foregoing authorities as a material inducement to
make this Agreement and that said appointment is coupled with an interest and is
accordingly irrevocable. Purchaser agrees that said escrow holder shall not be
liable to any party hereof (or to any other

                                      -3-
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party). The escrow holder may rely upon any letter, notice or other document
executed by any signature purported to be genuine and may resign at any time.
Purchaser agrees that if the Secretary of the Company, or the Secretary's
designee, resigns as escrow holder for any or no reason, the Board of Directors
of the Company shall have the power to appoint a successor to serve as escrow
holder pursuant to the terms of this Agreement.

     5.   Investment and Taxation Representations.  In connection with the
          ---------------------------------------
purchase of the Shares, Purchaser represents to the Company the following:

          (a)  Purchaser is aware of the Company's business affairs and
financial condition and has acquired sufficient information about the Company to
reach an informed and knowledgeable decision to acquire the Shares. Purchaser is
purchasing the Shares for investment for his or her own account only and not
with a view to, or for resale in connection with, any "distribution" thereof
within the meaning of the Securities Act.

          (b)  Purchaser understands that the Shares have not been registered
under the Securities Act by reason of a specific exemption therefrom, which
exemption depends upon, among other things, the bona fide nature of Purchaser's
investment intent as expressed herein.

          (c)  Purchaser further acknowledges and understands that the Shares
must be held indefinitely unless they are subsequently registered under the
Securities Act or an exemption from such registration is available. Purchaser
further acknowledges and understands that the Company is under no obligation to
register the Shares. Purchaser understands that the certificate evidencing the
Shares will be imprinted with a legend which prohibits the transfer of the
Shares unless they are registered or such registration is not required in the
opinion of counsel for the Company.

          (d)  Purchaser is familiar with the provisions of Rules 144 and 701,
each promulgated under the Securities Act, which, in substance, permit limited
public resale of "restricted securities" acquired, directly or indirectly, from
the issuer thereof (or from an affiliate of such issuer), in a non-public
offering subject to the satisfaction of certain conditions. Rule 701 provides
that if the issuer qualifies under Rule 701 at the time of issuance of the
securities, such issuance will be exempt from registration under the Securities
Act. In the event the Company becomes subject to the reporting requirements of
Section 13 or 15(d) of the Securities Exchange Act of 1934 (the "Exchange Act"),
                                                                 ------------
the securities exempt under Rule 701 may be resold by Purchaser 90 days
thereafter, subject to the satisfaction of certain of the conditions specified
by Rule 144, including, among other things: (1) the sale being made through a
broker in an unsolicited "broker's transaction" or in transactions directly with
a market maker (as said term is defined under the Exchange Act); and (2) in the
case of an affiliate, the availability of certain public information about the
Company, and the amount of securities being sold during any three month period
not exceeding the limitations specified in Rule 144(e), if applicable.
Notwithstanding this Section 5(d), Purchaser acknowledges and agrees to the
restrictions set forth in Section 5(f) hereof.

                                      -4-
<PAGE>

     In the event that the Company does not qualify under Rule 701 at the time
of purchase, then the Shares may be resold by Purchaser in certain limited
circumstances subject to the provisions of Rule 144, which requires, among other
things: (1) the availability of certain public information about the Company;
(2) the resale occurring not less than one year after the party has purchased,
and made full payment of (within the meaning of Rule 144), the securities to be
sold; and, in the case of an affiliate, or of a non-affiliate who has held the
securities less than two years, (3) the sale being made through a broker in an
unsolicited "broker's transaction" or in transactions directly with a market
maker (as such term is defined under the Exchange Act) and the amount of
securities being sold during any three month period not exceeding the specified
limitations stated therein, if applicable.

          (e)  Purchaser further understands that at the time he or she wishes
to sell the Shares there may be no public market upon which to make such a sale,
and that, even if such a public market then exists, the Company may not be
satisfying the current public information requirements of Rule 144 or 701, and
that, in such event, Purchaser would be precluded from selling the Shares under
Rule 144 or 701 even if the one-year minimum holding period had been satisfied.

          (f)  Purchaser further understands that in the event all of the
applicable requirements of Rule 144 or 701 are not satisfied, registration under
the Securities Act, compliance with Regulation A, or some other registration
exemption will be required; and that, notwithstanding the fact that Rules 144
and 701 are not exclusive, the Staff of the Securities and Exchange Commission
has expressed its opinion that persons proposing to sell private placement
securities other than in a registered offering and otherwise than pursuant to
Rule 144 or 701 will have a substantial burden of proof in establishing that an
exemption from registration is available for such offers or sales, and that such
persons and their respective brokers who participate in such transactions do so
at their own risk.

          (g)  Purchaser understands that Purchaser may suffer adverse tax
consequences as a result of Purchaser's purchase or disposition of the Shares.
Purchaser represents that Purchaser has consulted any tax consultants Purchaser
deems advisable in connection the purchase or disposition of the Shares and that
Purchaser is not relying on the Company for any tax advice.

     6.   Restrictive Legends and Stop-Transfer Orders.
          --------------------------------------------

          (a)  Legends.  The certificate or certificates representing the Shares
               -------
shall bear the following legends (as well as any legends required by applicable
state and federal corporate and securities laws):

          (i)  THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AND HAVE BEEN ACQUIRED FOR
INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR
DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN
EFFECTIVE REGISTRATION STATEMENT

                                      -5-
<PAGE>

RELATED THERETO OR AN OPINION OF COUNSEL FOR THE COMPANY THAT SUCH REGISTRATION
IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933.

          (ii)  THE SHARES REPRESENTED BY THIS CERTIFICATE MAY BE TRANSFERRED
ONLY IN ACCORDANCE WITH THE TERMS OF AN AGREEMENT BETWEEN THE COMPANY AND THE
STOCKHOLDER, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY.

          (iii) Any legend required to be placed thereon by the California
Commissioner of Corporations.

          (b)   Stop-Transfer Notices.  Purchaser agrees that, in order to
                ---------------------
ensure compliance with the restrictions referred to herein, the Company may
issue appropriate "stop transfer" instructions to its transfer agent, if any,
and that, if the Company transfers its own securities, it may make appropriate
notations to the same effect in its own records.

          (c)   Refusal to Transfer.  The Company shall not be required (i) to
                -------------------
transfer on its books any Shares that have been sold or otherwise transferred in
violation of any of the provisions of this Agreement or (ii) to treat as owner
of such Shares or to accord the right to vote or pay dividends to any purchaser
or other transferee to whom such Shares shall have been so transferred.

     7.   No Employment Rights.  Nothing in this Agreement shall affect in any
          --------------------
manner whatsoever the right or power of the Company, or a parent or subsidiary
of the Company, to terminate Purchaser's employment, for any reason, with or
without cause.

     8.   Section 83(b) Election. Purchaser understands that Section 83(a) of
          ----------------------
the Internal Revenue Code of 1986, as amended (the "Code"), taxes as ordinary
                                                    ----
income the difference between the amount paid for the Shares and the fair market
value of the Shares as of the date any restrictions on the Shares lapse. In this
context, "restriction" means the right of the Company to buy back the Shares
          -----------
pursuant to the Repurchase Option set forth in Section 3(a) of this Agreement.
Purchaser understands that Purchaser may elect to be taxed at the time the
Shares are purchased, rather than when and as the Repurchase Option expires, by
filing an election under Section 83(b) (an "83(b) Election") of the Code with
                                            --------------
the Internal Revenue Service within 30 days from the date of purchase. Even if
the fair market value of the Shares at the time of the execution of this
Agreement equals the amount paid for the Shares, the election must be made to
avoid income under Section 83(a) in the future. Purchaser understands that
failure to file such an election in a timely manner may result in adverse tax
consequences for Purchaser. Purchaser further understands that an additional
copy of such election form should be filed with his or her federal income tax
return for the calendar year in which the date of this Agreement falls.
Purchaser acknowledges that the foregoing is only a summary of the effect of
United States federal income taxation with respect to purchase of the Shares
hereunder, and does not purport to be complete. Purchaser further acknowledges
that the Company has directed Purchaser to seek independent advice regarding the
applicable provisions of the Code, the income tax laws of any

                                      -6-
<PAGE>

municipality, state or foreign country in which Purchaser may reside, and the
tax consequences of Purchaser's death.

          Purchaser agrees that he will execute and deliver to the Company with
this executed Agreement a copy of the Acknowledgment and Statement of Decision
Regarding Section 83(b) Election (the "Acknowledgment"), attached hereto as
                                       --------------
Exhibit C. Purchaser further agrees that Purchaser will execute and submit with
---------
the Acknowledgment a copy of the 83(b) Election, attached hereto as Exhibit D,
                                                                    ---------
if Purchaser has indicated in the Acknowledgment his or her decision to make
such an election.

     9.   Market Standoff Agreement.  In connection with the initial public
          -------------------------
offering of the Company's securities and upon request of the Company or the
underwriters managing any underwritten offering of the Company's securities,
Purchaser agrees not to sell, make any short sale of, loan, grant any option for
the purchase of, or otherwise dispose of any Shares (other than those included
in the registration) without the prior written consent of the Company or such
underwriters, as the case may be, for such period of time (not to exceed the
earlier of (i) 180 days; or (ii) the maximum period of time that any director,
officer or shareholder holding not less than 1% of the equity securities of the
Company shall be obligated pursuant to similar restrictions) from the effective
date of such registration as may be requested by the Company or such managing
underwriters and to execute an agreement reflecting the foregoing as may be
requested by the underwriters at the time of the public offering.

     10.   Miscellaneous.
           -------------

          (a)  Governing Law.  This Agreement and all acts and transactions
               -------------
pursuant hereto and the rights and obligations of the parties hereto shall be
governed, construed and interpreted in accordance with the laws of the State of
California, without giving effect to principles of conflicts of law.

          (b)  Entire Agreement; Enforcement of Rights.  This Agreement sets
               ---------------------------------------
forth the entire agreement and understanding of the parties relating to the
subject matter herein and merges all prior discussions between them.  No
modification of or amendment to this Agreement, nor any waiver of any rights
under this Agreement, shall be effective unless in writing signed by the parties
to this Agreement. The failure by either party to enforce any rights under this
Agreement shall not be construed as a waiver of any rights of such party.

          (c)  Severability.  If one or more provisions of this Agreement are
               ------------
held to be unenforceable under applicable law, the parties agree to renegotiate
such provision in good faith. In the event that the parties cannot reach a
mutually agreeable and enforceable replacement for such provision, then (i) such
provision shall be excluded from this Agreement, (ii) the balance of the
Agreement shall be interpreted as if such provision were so excluded and (iii)
the balance of the Agreement shall be enforceable in accordance with its terms.

          (d)  Construction.  This Agreement is the result of negotiations
               ------------
between and has been reviewed by each of the parties hereto and their respective
counsel, if any; accordingly,

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<PAGE>

this Agreement shall be deemed to be the product of all of the parties hereto,
and no ambiguity shall be construed in favor of or against any one of the
parties hereto.

          (e)  Notices.  Any notice required or permitted by this Agreement
               -------
shall be in writing and shall be deemed sufficient when delivered personally or
sent by telegram or fax or forty-eight (48) hours after being deposited in the
U.S. mail, as certified or registered mail, with postage prepaid, and addressed
to the party to be notified at such party's address as set forth below or as
subsequently modified by written notice.

          (f)  Counterparts.  This Agreement may be executed in two or more
               ------------
counterparts, each of which shall be deemed an original and all of which
together shall constitute one instrument.

          (g)  Successors and Assigns.  The rights and benefits of this
               ----------------------
Agreement shall inure to the benefit of, and be enforceable by the Company's
successors and assigns. The rights and obligations of Purchaser under this
Agreement may only be assigned with the prior written consent of the Company.

          (h)  California Corporate Securities Law.  THE SALE OF THE SECURITIES
               -----------------------------------
WHICH ARE THE SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE
COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF THE
SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR
PRIOR TO THE QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT
FROM QUALIFICATION BY SECTION 25100, 25102 OR 25105 OF THE CALIFORNIA
CORPORATIONS CODE.  THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE EXPRESSLY
CONDITIONED UPON THE QUALIFICATION BEING OBTAINED, UNLESS THE SALE IS SO EXEMPT.

                           [Signature Page Follows]

                                      -8-
<PAGE>

     The parties have executed this Agreement as of the date first set forth
above.

PETOPIA.COM, INC.

By:  /s/ Andrea C. Reisman
   ---------------------------
Name: Andrea C. Reisman
Title: Chief Executive Officer

Address:
357 Tehama Street
San Francisco, CA 94103-4113

     PURCHASER ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES PURSUANT TO
SECTION 3 HEREOF IS EARNED ONLY BY CONTINUING SERVICE AS AN EMPLOYEE OR
CONSULTANT AT THE WILL OF THE COMPANY. PURCHASER FURTHER ACKNOWLEDGES AND AGREES
THAT NOTHING IN THIS AGREEMENT SHALL CONFER UPON PURCHASER ANY RIGHT WITH
RESPECT TO CONTINUATION OF SUCH EMPLOYMENT OR CONSULTING RELATIONSHIP WITH THE
COMPANY, NOR SHALL IT INTERFERE IN ANY WAY WITH PURCHASER'S RIGHT OR THE
COMPANY'S RIGHT TO TERMINATE PURCHASER'S EMPLOYMENT OR CONSULTING RELATIONSHIP
AT ANY TIME, WITH OR WITHOUT CAUSE.

     PURCHASER:

     /s/ David Fraze
     ------------------------------
     (Signature)
     Name: David Fraze
     Address:

     Vesting Commencement Date: April 15, 1999

     I, ________________________________, spouse of David Fraze have read and
hereby approve the foregoing Agreement. In consideration of the Company's
granting my spouse the right to purchase the Shares as set forth in the
Agreement, I hereby agree to be irrevocably bound by the Agreement and further
agree that any community property or other such interest shall be similarly
bound by the Agreement. I hereby appoint my spouse as my attorney-in-fact with
respect to any amendment or exercise of any rights under the Agreement.

     ______________________________

             SIGNATURE PAGE OF RESTRICTED STOCK PURCHASE AGREEMENT
             -----------------------------------------------------

          Spouse of Purchaser

                                      -2-<PAGE>

                                                                   Exhibit 10.11

                               PETOPIA.COM, INC.

                        COMMON STOCK PURCHASE AGREEMENT
                        -------------------------------

     This Common Stock Purchase Agreement (the "Agreement") is made as of July
                                                ---------
12, 1999, by and between Petopia.com, Inc., a Delaware corporation (the
"Company"), and Brian Devine ("Purchaser"), an employee of PETCO Animal
 -------                       ---------
Supplies, Inc. ("Petco").
                 -----

     1.   Sale of Stock.  Subject to the terms and conditions of this
          -------------
Agreement, on the Purchase Date (as defined below) the Company will issue and
sell to Purchaser, and Purchaser agrees to purchase from the Company, 300,000
shares of the Company's Common Stock (the "Shares") at a purchase price of
                                           ------
$0.6375 per Share for a total purchase price of $191,250.00. The term "Shares"
refers to the purchased Shares and all securities received in replacement of or
in connection with the Shares pursuant to stock dividends or splits, all
securities received in replacement of the Shares in a recapitalization, merger,
reorganization, exchange or the like, and all new, substituted or additional
securities or other properties to which Purchaser is entitled by reason of
Purchaser's ownership of the Shares. Upon payment therefor, such Shares will be
duly and validly issued, fully paid and non-assessable.

     2.   Purchase.  The purchase and sale of the Shares under this Agreement
          --------
shall occur at the principal office of the Company simultaneously with the
execution of this Agreement or at such other time and place as the Company and
Purchaser shall agree (the "Purchase Date"). On the Purchase Date, the
                            -------------
Company will deliver to Purchaser a certificate representing the Shares to be
purchased by Purchaser (which shall be issued in Purchaser's name) against
payment of the purchase price therefor by cash or check. If Purchaser pays for
the Shares by executing a promissory note in favor of any third party, such note
must be full recourse.

     3.   Limitations on Transfer.  In addition to any other limitation on
          -----------------------
transfer created by applicable securities laws, all Shares initially shall be
Restricted Shares and shall be subject to a right (but not an obligation) of
repurchase by the Company and a Company right of first refusal, and Purchaser
shall not transfer, assign, encumber or otherwise dispose of any Shares except
pursuant to this Section 3 hereof. If the Purchaser transfers any Restricted
Shares, then Section 3 shall apply to the Transferee to the same extent as to
the Purchaser.

          (a)  Right of Repurchase.
               --------------------

               (i)   Scope of Right of Repurchase.  All Shares initially shall
be subject to a right (but not an obligation) of repurchase by the Company, and
Purchaser shall not transfer, assign, encumber or otherwise dispose of any
Restricted Shares except pursuant to this Section 3 hereof.

               (ii)  Condition Precedent to Exercise.  The Right of Repurchase
shall be exercisable during the 60-day period following the date when the
Purchaser's Service to Petco terminates for any reason.
<PAGE>

               (iii) Repurchase Price.  If the Company exercises the Right of
Repurchase, it shall pay the Purchaser an amount equal to the Fair Market Value
for each of the Restricted Shares being repurchased. The Company's rights under
this Section 3 shall be freely assignable, in whole or in part. The term "Fair
Market Value" shall mean the greatest of (A) the most recent valuation completed
for the Company by an independent third party valuation firm, (B) the last sale
by the Company of its Common Stock to an independent third party, and (C) the
fair market value of the Common Stock as most recently determined by the
Company's Board of Directors.

               (iv)  Exercise of Repurchase Right.  The Right of Repurchase
shall be exercisable only by written notice delivered to the Purchaser prior to
the expiration of the 60-day period specified in Subsection (a)(ii) above. The
notice shall set forth the date on which the repurchase is to be effected. Such
date shall not be more than 30 days after the date of the notice. The
certificate(s) representing the Restricted Shares to be repurchased shall, prior
to the close of business on the date specified for the repurchase, be delivered
to the Company properly endorsed for transfer. The Company shall, concurrently
with the receipt of such certificate(s), pay to the Purchaser the purchase price
determined according to Subsection (a)(iii) above. Payment shall be made in cash
or cash equivalents or by canceling indebtedness to the Company incurred by the
Purchaser in the purchase of the Restricted Shares. The Right of Repurchase
shall terminate with respect to any Restricted Shares for which it has not been
timely exercised pursuant to this Subsection (a)(iv).

               (v)   Additional Shares or Substituted Securities.  In the event
of the declaration of a stock dividend, the declaration of an extraordinary
dividend payable in a form other than stock, a spin-off, a stock split, an
adjustment in conversion ratio, a recapitalization or a similar transaction
affecting the Company's outstanding securities without receipt of consideration,
any new, substituted or additional securities or other property (including money
paid other than as an ordinary cash dividend) which are by reason of such
transaction distributed with respect to any Restricted Shares or into which such
Restricted Shares thereby become convertible shall immediately be subject to the
Right of Repurchase. Appropriate adjustments to reflect the distribution of such
securities or property shall be made to the number and/or class of the
Restricted Shares.

               (vi)  Termination of Rights as Stockholder.  If the Company makes
available, at the time and place and in the amount and form provided in this
Agreement, the consideration for the Restricted Shares to be repurchased in
accordance with this Section 2, then after such time the person from whom such
Restricted Shares are to be repurchased shall no longer have any rights as a
holder of such Restricted Shares (other than the right to receive payment of
such consideration in accordance with this Agreement). Such Restricted Shares
shall be deemed to have been repurchased in accordance with the applicable
provisions hereof, whether or not the certificate(s) therefor have been
delivered as required by this Agreement.

               (vii) Termination of Right of Repurchase.  The Right of
Repurchase shall terminate upon the earliest to occur of: (A) the closing of a
firm commitment underwritten public offering of the Company's Common Stock
pursuant to an effective registration statement under the Securities Act of
1933, as amended (the "Securities Act"); (B) a sale of all or
                       --------------

                                      -2-
<PAGE>

substantially all of the assets of the Company or the merger or consolidation of
the Company with or into any other corporation or entity, other than a wholly-
owned subsidiary of the Company, or the sale of the outstanding stock of the
Company, as a result of which the stockholders of the Company immediately prior
to such transaction hold less that fifty percent (50%) of the voting power of
the surviving corporation; and (C) five (5) years from the date hereof.

          (b)  Right Of First Refusal.
               ----------------------

               (i)   Right of First Refusal.  In the event that the Purchaser
proposes to sell, pledge or otherwise transfer to a third party any Shares
acquired under this Agreement, the Company shall have the Right of First Refusal
with respect to all (and not less than all) of such Shares. If the Purchaser
desires to transfer Shares acquired under this Agreement, the Purchaser shall
give a written Transfer Notice to the Company describing fully the proposed
transfer, including the number of Shares proposed to be transferred, the
proposed transfer price, the name and address of the proposed Transferee and
proof satisfactory to the Company that the proposed sale or transfer will not
violate any applicable federal or state securities laws. The Transfer Notice
shall be signed both by the Purchaser and by the proposed transferee
("Transferee") and must constitute a binding commitment of both parties to the
transfer of the Shares. The Company shall have the right to purchase all, and
not less than all, of the Shares at the Fair Market Value of such Shares
(subject, however, to any change in such terms permitted under Subsection (b)
below) by delivery of a notice of exercise of the Right of First Refusal within
30 days after the date when the Transfer Notice was received by the Company. The
Company's rights under this Subsection (a) shall be freely assignable, in whole
or in part.

               (ii)  Transfer of Shares.  If the Company fails to exercise its
Right of First Refusal within 30 days after the date when it received the
Transfer Notice, the Purchaser may, not later than 90 days following receipt of
the Transfer Notice by the Company, conclude a transfer of the Shares subject to
the Transfer Notice on the terms and conditions described in the Transfer
Notice, provided that any such sale is made in compliance with applicable
federal and state securities laws and not in violation of any other contractual
restrictions to which the Purchaser is bound. Any proposed transfer on terms and
conditions different from those described in the Transfer Notice, as well as any
subsequent proposed transfer by the Purchaser, shall again be subject to the
Right of First Refusal and shall require compliance with the procedure described
in Subsection (a) above. If the Company exercises its Right of First Refusal,
the parties shall consummate the sale of the Shares on the terms set forth in
the Transfer Notice within 60 days after the date when the Company received the
Transfer Notice (or within such longer period as may have been specified in the
Transfer Notice).

               (iii) Additional Shares or Substituted Securities.  In the event
of the declaration of a stock dividend, the declaration of an extraordinary
dividend payable in a form other than stock, a spin-off, a stock split, an
adjustment in conversion ratio, a recapitalization or a similar transaction
affecting the Company's outstanding securities without receipt of consideration,
any new, substituted or additional securities or other property (including money
paid other than as an ordinary cash dividend) which are by reason of such
transaction distributed with respect to any Shares subject to this Section 3 or
into which such Shares thereby become

                                      -3-
<PAGE>

convertible shall immediately be subject to this Section 3 Appropriate
adjustments to reflect the distribution of such securities or property shall be
made to the number and/or class of the Shares subject to this Section 3.

               (iv)  Termination of Right of First Refusal.  Any other provision
of this Section 3 notwithstanding, in the event that the Stock is readily
tradable on an established securities market when the Purchaser desires to
transfer Shares, the Company shall have no Right of First Refusal, and the
Purchaser shall have no obligation to comply with the procedures prescribed by
Subsections (a) and (b) above.

               (v)   Permitted Transfers.  This Section 3 shall not apply to (i)
a transfer by beneficiary designation, will or intestate succession or (ii) a
transfer to the Purchaser's spouse, children or grandchildren or to a trust
established by the Purchaser for the benefit of the Purchaser or the Purchaser's
spouse, children or grandchildren, provided in either case that (i) Purchaser
provides ten (10) business days prior written notice to the Company of his or
her intent to so transfer the Shares and the Company provides written approval
of such transfer to Purchaser, and (ii) the Transferee agrees in writing on a
form prescribed by the Company to be bound by all provisions of this Agreement.
If the Purchaser transfers any Shares acquired under this Agreement, either
under this Subsection (e) or after the Company has failed to exercise the Right
of First Refusal, then this Section 3 shall apply to the Transferee to the same
extent as to the Purchaser.

               (vi)  Termination of Rights as Stockholder.  If the Company makes
available, at the time and place and in the amount and form provided in this
Agreement, the consideration for the Shares to be purchased in accordance with
this Section 3, then after such time the person from whom such Shares are to be
purchased shall no longer have any rights as a holder of such Shares (other than
the right to receive payment of such consideration in accordance with this
Agreement). Such Shares shall be deemed to have been purchased in accordance
with the applicable provisions hereof, whether or not the certificate(s)
therefor have been delivered as required by this Agreement.

     4.   Purchaser's Put Right.
          ---------------------

          (a)  If (i) the Company's web site located at the URL of
www.petopia.com (the "petopia.com Site") has not launched (defined as the date
---------------       ----------------
on which third party users are first able to access via the World Wide Web and
execute electronic commerce transactions on the Company's petopia.com Site) by
September 1, 1999, and (ii) PETCO Animal Supplies, Inc. exercises its Put Right
under the terms of the Series C Preferred Stock Purchase Agreement dated as of
even date herewith, the Company shall have the obligation to buy from Purchaser,
and Purchaser has the obligation to sell, all but not less than all of the
Common Stock held by Purchaser on such date for $191,250.00, the aggregate
purchase price paid by Purchaser for the Shares (the "Purchaser Put Right").
                                                      -------------------
The Company and the Purchaser shall each have a period of ten (10) days after
September 1, 1999 to elect to exercise its Purchaser Put Right by delivering
written notice (the "Exercise Notice") to the other party stating its election
                     ---------------
to exercise such Purchaser Put Right.  The Exercise Notice shall be delivered by
overnight courier. Upon the exercise of the Purchaser Put Right by either
party, Purchaser shall then promptly deliver to the

                                      -4-
<PAGE>

Company's executive offices to the attention of the Chief Financial Officer, the
stock certificate(s) for the Common Stock to be repurchased by the Company,
appropriately endorsed to the Company. The Exercise Notice, once delivered,
shall be irrevocable. The Company shall send a check to Purchaser in the amount
of the aggregate purchase price for the Common Stock within ten (10) business
days after receipt of such stock certificate.

          (b)  Upon the date of repayment by the Company to Purchaser of the
full purchase price for the Common Stock, this Agreement shall terminate in full
and Purchaser shall have no further rights under this Agreement or as a
stockholder of the Company. Purchaser agrees to do such further acts and to
execute, acknowledge and deliver such further documents or instruments necessary
to effect the intent of this Section. This Purchaser Put Right (i) may be
assigned by the Company; (ii) shall not be transferable by Purchaser; and (iii)
shall be subject to and limited by all applicable federal and state securities
and corporate laws and regulations.

     5.   Investment and Taxation Representations.  In connection with the
          ---------------------------------------
purchase of the Shares, Purchaser represents to the Company the following:

          (a)  Purchaser is an "accredited investor" as defined in Rule 501(a)
of Regulation D promulgated under the Securities Act.

          (b)  Purchaser is aware of the Company's business affairs and
financial condition and has acquired sufficient information about the Company to
reach an informed and knowledgeable decision to acquire the Shares. Purchaser is
purchasing the Shares for investment for his or her own account only and not
with a view to, or for resale in connection with, any "distribution" thereof
within the meaning of the Securities Act.

          (c)  Purchaser understands that the Shares have not been registered
under the Securities Act by reason of a specific exemption therefrom, which
exemption depends upon, among other things, the bona fide nature of Purchaser's
investment intent as expressed herein.

          (d)  Purchaser further acknowledges and understands that the Shares
must be held indefinitely unless they are subsequently registered under the
Securities Act or an exemption from such registration is available. Purchaser
further acknowledges and understands that the Company is under no obligation to
register the Shares. Purchaser understands that the certificate evidencing the
Shares will be imprinted with a legend which prohibits the transfer of the
Shares unless they are registered or such registration is not required in the
opinion of counsel for the Company.

          (e)  Purchaser is familiar with the provision of Rule 144, promulgated
under the Securities Act, which, in substance, permit limited public resale of
"restricted securities" acquired, directly or indirectly, from the issuer
thereof (or from an affiliate of such issuer), in a non-public offering subject
to the satisfaction of certain conditions, including, among other things: (i)
the availability of certain public information about the Company; (ii) the
resale occurring not less than one year after the party has purchased and made
full payment for, within the meaning of Rule 144, the securities to be sold;
and, in the case of an affiliate, or of a non-affiliate who has held the
securities less than two years, (iii) the sale being made through a broker

                                      -5-
<PAGE>

in an unsolicited "broker's transaction" or in transactions directly with a
market maker (as such term is defined under the Securities Exchange Act of 1934)
and the amount of securities being sold during any three month period not
exceeding the specified limitations stated therein, if applicable.

          (f)  Purchaser further understands that at the time he or she wishes
to sell the Shares there may be no public market upon which to make such a sale,
and that, even if such a public market then exists, the Company may not be
satisfying the current public information requirements of Rule 144, and that, in
such event, Purchaser would be precluded from selling the Shares under Rule 144
even if the one-year minimum holding period had been satisfied.

          (g)  Purchaser further understands that in the event all of the
applicable requirements of Rule 144 are not satisfied, registration under the
Securities Act, compliance with Regulation A or some other registration
exemption will be required; and that, notwithstanding the fact that Rule 144 is
not exclusive, the Staff of the Securities and Exchange Commission has expressed
its opinion that persons proposing to sell private placement securities other
than in a registered offering and otherwise than pursuant to Rule 144 will have
a substantial burden of proof in establishing that an exemption from
registration is available for such offers or sales, and that such persons and
their respective brokers who participate in such transactions do so at their own
risk.

          (h)  Purchaser understands that Purchaser may suffer adverse tax
consequences as a result of Purchaser's purchase or disposition of the Shares.
Purchaser represents that Purchaser has consulted any tax consultants Purchaser
deems advisable in connection the purchase or disposition of the Shares and that
Purchaser is not relying on the Company for any tax advice.

     6.   Restrictive Legends and Stop-Transfer Orders.
          --------------------------------------------

          (a)  Legends.  The certificate or certificates representing the Shares
               -------
shall bear the following legends (as well as any legends required by applicable
state and federal corporate and securities laws):

               (i)   THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
                     REGISTERED UNDER THE SECURITIES ACT OF 1933, AND HAVE BEEN
                     ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN
                     CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH
                     SALE OR DISTRIBUTION MAY BE EFFECTED WITHOUT AN EFFECTIVE
                     REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF
                     COUNSEL IN A FORM SATISFACTORY TO THE COMPANY THAT SUCH
                     REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF
                     1933.

                                      -6-
<PAGE>

               (ii)  THE SHARES REPRESENTED BY THIS CERTIFICATE MAY BE
                     TRANSFERRED ONLY IN ACCORDANCE WITH THE TERMS OF AN
                     AGREEMENT BETWEEN THE COMPANY AND THE STOCKHOLDER, A COPY
                     OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY.

               (iii) Any legend required to be placed thereon by the California
                     Commissioner of Corporations and other applicable state
                     securities laws.

          (b)  Stop-Transfer Notices.  Purchaser agrees that, in order to ensure
               ---------------------
compliance with the restrictions referred to herein, the Company may issue
appropriate "stop transfer" instructions to its transfer agent, if any, and
that, if the Company transfers its own securities, it may make appropriate
notations to the same effect in its own records.

          (c)  Refusal to Transfer.  The Company shall not be required (i) to
               -------------------
transfer on its books any Shares that have been sold or otherwise transferred in
violation of any of the provisions of this Agreement or (ii) to treat as owner
of such Shares or to accord the right to vote or pay dividends to any purchaser
or other transferee to whom such Shares shall have been so transferred.

     7.   No Employment Rights.  Nothing in this Agreement shall affect in any
          --------------------
manner whatsoever the right or power of Petco, or a parent or subsidiary of
Petco, to terminate Purchaser's employment, for any reason, with or without
cause.

     8.   Market Standoff Agreement.  In connection with the initial public
          -------------------------
offering of the Company's securities, Purchaser agrees not to sell, make any
short sale of, loan, grant any option for the purchase of, or otherwise dispose
of any Shares (other than those included in the registration) without the prior
written consent of the Company or underwriters managing any underwritten
offering of the Company's securities, as the case may be, for such period of
time (not to exceed one hundred eighty (180) days) from the effective date of
such registration as may be requested by the Company or such managing
underwriters and to execute an agreement reflecting the foregoing as may be
requested by the underwriters at the time of the public offering.

     9.   Escrow of Shares.  For purposes of facilitating the enforcement of the
          ----------------
provisions hereof, Purchaser agrees, immediately upon receipt of the
certificate(s) for the Shares subject to the Repurchase Option and Right of
First Refusal, to deliver such certificate(s), together with an Assignment
Separate from Certificate in the form attached to this Agreement as Exhibit A
                                                                    ---------
executed by Purchaser and by Purchaser's spouse (if required for transfer), in
blank, to the Secretary of the Company, or the Secretary's designee, to hold
such certificate(s) and Assignment Separate from Certificate in escrow and to
take all such actions and to effectuate all such transfers and/or releases as
are in accordance with the terms of this Agreement. Purchaser hereby
acknowledges that the Secretary of the Company, or the Secretary's designee, is
so appointed as the escrow holder with the foregoing authorities as a material
inducement to make this Agreement and that said appointment is coupled with an
interest and is accordingly irrevocable.

                                      -7-
<PAGE>

Purchaser agrees that said escrow holder shall not be liable to any party hereof
(or to any other party), except that the Company agrees to pay all costs
associated with obtaining a replacement certificate in the event the Purchaser's
original certificate representing the Shares is lost while in the custody of the
Secretary of the Company, or of the Secretary's designee. The escrow holder may
rely upon any letter, notice or other document executed by any signature
purported to be genuine and may resign at any time. Purchaser agrees that if the
Secretary of the Company, or the Secretary's designee, resigns as escrow holder
for any or no reason, the Board of Directors of the Company shall have the power
to appoint a successor to serve as escrow holder pursuant to the terms of this
Agreement.

     10.  Miscellaneous.
          -------------

          (a)  Governing Law.  This Agreement and all acts and transactions
               -------------
pursuant hereto and the rights and obligations of the parties hereto shall be
governed, construed and interpreted in accordance with the laws of the State of
California, without giving effect to principles of conflicts of law.

          (b)  Entire Agreement; Enforcement of Rights.  This Agreement sets
               ---------------------------------------
forth the entire agreement and understanding of the parties relating to the
subject matter herein and merges all prior discussions between them.  No
modification of or amendment to this Agreement, nor any waiver of any rights
under this Agreement, shall be effective unless in writing signed by the parties
to this Agreement.  The failure by either party to enforce any rights under this
Agreement shall not be construed as a waiver of any rights of such party.

          (c)  Severability.  If one or more provisions of this Agreement are
               ------------
held to be unenforceable under applicable law, the parties agree to renegotiate
such provision in good faith.  In the event that the parties cannot reach a
mutually agreeable and enforceable replacement for such provision, then (i) such
provision shall be excluded from this Agreement, (ii) the balance of the
Agreement shall be interpreted as if such provision were so excluded, and (iii)
the balance of the Agreement shall be enforceable in accordance with its terms.

          (d)  Construction.  This Agreement is the result of negotiations
               ------------
between and has been reviewed by each of the parties hereto and their respective
counsel, if any; accordingly, this Agreement shall be deemed to be the product
of all of the parties hereto, and no ambiguity shall be construed in favor of or
against any one of the parties hereto.

          (e)  Notices.  Any notice required or permitted by this Agreement
               -------
shall be in writing and shall be deemed sufficient when delivered personally or
sent by telegram or fax or forty-eight (48) hours after being deposited in the
U.S. mail, as certified or registered mail, with postage prepaid, and addressed
to the party to be notified at such party's address as set forth below or as
subsequently modified by written notice.

          (f)  Counterparts.  This Agreement may be executed in two or more
               ------------
counterparts, each of which shall be deemed an original and all of which
together shall constitute one instrument.

                                      -8-
<PAGE>

          (g)  Successors and Assigns. The rights and benefits of this Agreement
               ----------------------
shall inure to the benefit of, and be enforceable by the Company's successors
and assigns. The rights and obligations of Purchaser under this Agreement may
only be assigned with the prior written consent of the Company.

          (h)  California Corporate Securities Law.  THE SALE OF THE SECURITIES
               -----------------------------------
WHICH ARE THE SUBJECT OF THIS AGREEMENT HAS NOT BEEN QUALIFIED WITH THE
COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA AND THE ISSUANCE OF THE
SECURITIES OR THE PAYMENT OR RECEIPT OF ANY PART OF THE CONSIDERATION THEREFOR
PRIOR TO THE QUALIFICATION IS UNLAWFUL, UNLESS THE SALE OF SECURITIES IS EXEMPT
FROM QUALIFICATION BY SECTION 25100, 25102 OR 25105 OF THE CALIFORNIA
CORPORATIONS CODE. THE RIGHTS OF ALL PARTIES TO THIS AGREEMENT ARE EXPRESSLY
CONDITIONED UPON THE QUALIFICATION BEING OBTAINED, UNLESS THE SALE IS SO EXEMPT.

                           [Signature Page Follows]

                                      -9-
<PAGE>

     The parties have executed this Agreement as of the date first set forth
above.

                              PETOPIA.COM, INC.

                              By: /s/  David Fraze
                                  ------------------------------------

                              Title: Chief Financial Officer
                                     ---------------------------------

                              Address:
                                     357 Tehama Street
                                     San Francisco, CA 94103

     PURCHASER ACKNOWLEDGES AND AGREES THAT NOTHING IN THIS AGREEMENT SHALL
CONFER UPON PURCHASER ANY RIGHT WITH RESPECT TO CONTINUATION OF SUCH EMPLOYMENT
OR CONSULTING RELATIONSHIP WITH PETCO, NOR SHALL IT INTERFERE IN ANY WAY WITH
PURCHASER'S RIGHT OR PETCO'S RIGHT TO TERMINATE PURCHASER'S EMPLOYMENT OR
CONSULTING RELATIONSHIP AT ANY TIME, WITH OR WITHOUT CAUSE.

                              PURCHASER:

                              Brian Devine

                              /s/ Brian Devine
                              --------------------------------
                              (Signature)

                              Address:
                              P.O. Box 1305
                              Rancho Santa Fe, CA 92067-1305

I, Sylvia K. Devine, spouse of Brian Devine, have read and hereby approve the
foregoing Agreement. In consideration of the Company's granting my spouse the
right to purchase the Shares as set forth in the Agreement, I hereby agree to be
irrevocably bound by the Agreement and further agree that any community property
or other such interest shall be similarly bound by the Agreement. I hereby
appoint my spouse as attorney-in-fact with respect to any amendment or exercise
of any rights under the Agreement.

                              /s/ Sylvia K. Devine
                              --------------------------------
                              Spouse of Brian Devine

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