Document:

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                                                                     Exhibit 4.2

                                 AMENDMENT NO. 1
                                       TO
                             STOCKHOLDERS AGREEMENT

         THIS AMENDMENT NO. 1 (this "Amendment") TO STOCKHOLDERS AGREEMENT
entered into as of September 20, 2000 (the "Stockholders Agreement") is dated as
of ____________ __, 2001, by and among VCA Antech, Inc, a Delaware corporation
(the "Company"), Green Equity Investors III, L.P., a Delaware limited
partnership (the "Purchaser"), VCA Co-Investment Fund I, LLC, a Delaware limited
liability company ("VCA I"), VCA Co-Investment Fund II, LLC, a Delaware limited
liability company ("VCA II"), VCA Co-Investment Fund III, LLC, a Delaware
limited liability company ("VCA III"), VCA Co-Investment Fund IV, LLC, a
Delaware limited liability company ("VCA IV"), VCA Co-Investment Fund V, LLC, a
Delaware limited liability company ("VCA V"), VCA Co-Investment Fund VI, LLC., a
Delaware limited liability company ("VCA VI"), VCA Co-Investment Fund VII, LLC.,
a Delaware limited liability company ("VCA VII") and VCA Co-Investment Fund
VIII, LLC., a Delaware limited liability company ("VCA VIII" and, together with
VCA I, VCA II, VCA III, VCA IV, VCA V, VCA VI and VCA VII, the "VCA
Co-Investment Funds"), GS Mezzanine Partners II, L.P., a Delaware limited
partnership ("GS Mezzanine"), GS Mezzanine Partners II Offshore, L.P., an
exempted limited partnership organized under the laws of the Cayman Islands ("GS
Mezzanine Offshore," and, together with GS Mezzanine, the "GS Purchasers"), TCW
Leveraged Income Trust, L.P., a Delaware limited partnership ("TCW I"), TCW
Leveraged Income Trust II, L.P., a Delaware limited partnership ("TCW II"), TCW
Leveraged Income Trust IV, L.P., a Delaware limited partnership ("TCW III"),
TCW/Crescent Mezzanine Partners II, L.P., a Delaware limited partnership ("TCW
IV"), TCW/Crescent Mezzanine Trust II, a closed-end Delaware statutory business
trust ("TCW V" and, together with TCW I, TCW II, TCW III and TCW IV, the "TCW
Purchasers"), The Northwestern Mutual Life Insurance Company, a Wisconsin
corporation ("Northwestern" and, together with the GS Purchasers and the TCW
Purchasers, the "Mezzanine Purchasers"), and each of the management or employee
stockholders named on the signature pages to the Stockholders Agreement
(collectively, the "Management Stockholders" and, individually, a "Management
Stockholder"). Each of the parties to the Stockholders Agreement, as amended by
this Amendment (other than the Company) and any other Person who in accordance
with the terms of the Stockholders Agreement shall become a party to, or agree
to be bound by the terms of, the Stockholders Agreement, as amended by this
Amendment, after the date hereof is sometimes hereinafter referred to,
individually, as a "Stockholder" and, collectively, as "Stockholders." The
Purchaser and the VCA Co-Investment Funds are sometimes herein referred to,
individually, as an "Investor" and, collectively, as "Investors." Capitalized
terms used and not defined herein shall have those meanings ascribed to them in
the Stockholders Agreement.

                                  R E C I T A L

         WHEREAS, On September 20, 2000, the Company completed a
recapitalization transaction (the "Recapitalization") pursuant to the terms and
conditions of that certain

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         Amended and Restated Agreement and Plan of Merger dated as of August
11, 2000 (the "Merger Agreement").

         WHEREAS, as a condition precedent to the closing under the Merger
Agreement, the Company and the Stockholders executed and delivered the
Stockholders Agreement;

         WHEREAS, Article 6 of the Stockholders Agreement provides that
specified provisions of the Stockholders Agreement, including the provisions of
Section 2.8 of the Stockholders Agreement, terminate on the date of a Public
Offering Event; and

         WHEREAS, the Company and each of the Stockholders desire, for their
mutual benefit and protection, to enter into this Amendment to modify the terms
of each Call Option set forth in Section 2.8 of the Stockholders Agreement and
to modify the termination provisions of Article 6 as applicable to Section 2.8
of the Stockholders Agreement.

                                A G R E E M E N T

         NOW, THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties hereto agree as follows:

         1.    Upon the occurrence of a Public Offering Event:

               1.1 Antin Call Option. Call Option rights shall expire on
                   -----------------
one-half of the Antin Callable Shares. Call Option rights shall expire on the
remaining Antin Callable Shares in equal monthly installments over the six month
period commencing on the date of the Public Offering Event, as though the Public
Offering Event occurred on October 1, 2001. The term "Antin Vesting Period" in
the Stockholders Agreement is revised to reflect the provisions of this Section
1.1.

               1.2 Executive Employee Call Option. Call Option rights shall
                   ------------------------------
expire on one-half of each Executive Employee's Executive Callable Shares. Call
Option rights shall expire on one-half of the remaining Executive Callable
Shares of each Executive Employee six months following the date of the Public
Offering Event, and on the other one-half of the remaining Executive Callable
Shares of each Executive Employee, one year following the date of the Public
Offering Event, in each case as though the Public Offering Event occurred on
October 1, 2001. The term "Executive Vesting Period" in the Stockholders
Agreement is revised to reflect the provisions of this Section 1.2.

               1.3 Management Employee Call Option. Call Option rights shall
                   -------------------------------
expire on one-half of each Management Employee's Management Callable Shares.
Call Option rights shall expire on the remaining Management Callable Shares of
each Management Employee in equal monthly installments over the twelve month
period commencing seven months following the date of the Public Offering Event,
as though the Public Offering Event occurred on October 1, 2001. The term
"Management Vesting Period" in the Stockholders Agreement is revised to reflect
the provisions of this Section 1.3.

                                       2

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          1.4 Article 6 of the Stockholders Agreement is amended and restated to
read in its entirety as follows:

     Subject to the next succeeding sentence, this Agreement shall terminate ten
(10) years from the date of this Agreement with respect to all rights and
obligations pertaining to Common Shares and this Agreement shall terminate
twelve (12) years from the date of this Agreement with respect to all rights and
obligations pertaining to Preferred Shares. If any rights and obligations
provided in Article 1, Article 3, Section 2.3, Section 2.4, Section 2.5, Section
2.6, Section 2.7, Section 2.8.4 or Section 2.9 of this Agreement have not
terminated earlier in accordance with the preceding sentence, such rights and
obligations shall terminate on the date of a Public Offering Event.

     2.   Except as amended by this Amendment, the Stockholders Agreement will
continue unmodified and in full force and effect.

     3.   This Amendment may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

                      [Signature Page Immediately Follows]

                                       3

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     IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement as
of the day and year first set forth above.

                               VCA ANTECH, INC.

                               By:____________________________________________
                                   Name:
                                   Title:

                               GREEN EQUITY INVESTORS III, L.P.

                               By:  GEI Capital III, LLC, its general partner

                               By:____________________________________________
                                   Name:  John Danhakl
                                   Title:  Manager

                               GS MEZZANINE PARTNERS II, L.P.

                               By:  GS MEZZANINE ADVISORS II, L.L.C.,
                                    its general partner

                               By:____________________________________________
                                   Name:
                                   Title:

                               _______________________________________________
                               Robert L. Antin

                                       4<PAGE>

                                                                    EXHIBIT 10.1

                              AMENDED AND RESTATED
                              EMPLOYMENT AGREEMENT

     This Amended and Restated Employment Agreement (the "Amended Agreement") is
made and entered into as of the __ day of October, 2001, by and between VCA
Antech, Inc., a Delaware corporation (the "Company") and Robert L. Antin, an
individual ("Officer").

                                 R E C I T A L S

     A. Officer is currently employed as Chairman of the Board, Chief Executive
Officer and President of the Company pursuant to an Employment Agreement (the
"Employment Agreement") between the Company and Officer dated as of September
20, 2000.

     B. The Company and Officer desire to amend and restate the Employment
Agreement regarding the terms and conditions of Officer's employment by the
Company.

                                A G R E E M E N T

     NOW, THEREFORE, in consideration of the foregoing recitals and the terms,
covenants and conditions contained herein, the Company and Officer agree as
follows:

     1. EMPLOYMENT.
        ----------

     Company hereby employs Officer, and Officer hereby accepts such employment,
as Chairman of the Board, Chief Executive Officer and President of the Company,
on the terms and subject to the conditions set forth herein.

     2. CAPACITY AND DUTIES.
        -------------------

        2.1 Officer shall serve the Company as its Chairman of the Board, Chief
Executive Officer and President and shall report directly to the Board of
Directors of the Company (the "Board of Directors").

        2.2 Subject to the direction and control of the Board of Directors,
Officer shall have the full authority and responsibility to operate and manage,
on a day to day basis, the business and affairs of the Company, and shall
perform such other duties and responsibilities as are prescribed by the Bylaws
of the Company and which are customarily vested in the office of chief executive
officer of a corporation.

        2.3 Officer shall devote his business time, energy and efforts
faithfully and diligently to promote the Company's interests.

        2.4 The terms of this Section 2 shall not prevent Officer from investing
or otherwise managing his assets in such form or manner as he chooses and
spending such time, whether or not during business hours, as he deems necessary
to manage his investments, so long as he is able to fulfill his duties pursuant
to Section 2 above.

                                       1

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        2.5 Except for routine travel incident to the business of the Company,
Officer shall perform his duties and obligations under this Amended Agreement
principally from an office provided by the Company in Los Angeles, California or
the surrounding area.

     3. TERM.
        ----

     This Amended Agreement shall be effective as of the date hereof (the
"Effective Date") and shall govern Officer's employment from and after such
date. As of any given date, (the "Date of Determination"), Officer's employment
shall terminate on the fifth anniversary of the Date of Determination, unless
sooner terminated in accordance with the provisions of this Amended Agreement or
extended by an amendment executed by the Company and the Officer (the "Term").
Accordingly, there shall always for all purposes be a minimum of at least five
years remaining on the Term under this Amended Agreement.

     4. COMPENSATION.
        ------------

        4.1 Base Salary.
            -----------

            4.1.1 As compensation for services rendered under this Amended
Agreement, the Company shall pay to Officer a base salary (the "Base Salary")
computed in accordance with Section 4.1.2 below during the Term, payable in
accordance with the normal payroll procedures of the Company.

            4.1.2 During the Term, Officer's Base Salary shall be $513,000 and
shall be adjusted as provided in this Section. Commencing on January 1, 2002 and
on each anniversary thereafter, or from time to time at the sole discretion of
the Compensation Committee of the Board of Directors (the "Compensation
Committee"), Officer's Base Salary shall be reviewed by the Compensation
Committee and may be increased, but may never be decreased, in the sole
discretion of the Compensation Committee. In determining whether to increase
Officer's Base Salary the Compensation Committee may engage a reputable
compensation consulting firm to determine comparable compensation packages
provided to executives in similarly situated companies.

            4.1.3 The Company may deduct from the Base Salary amounts sufficient
to cover applicable federal, state and/or local income tax withholdings and any
other amounts which the Company is required to withhold by applicable law.

        4.2 Cash Bonus Plan. The Compensation Committee shall adopt a cash bonus
            ---------------
plan designed to provide Officer an opportunity to earn annual cash bonuses
during each calendar year during his employment which, when added to Officer's
Base Salary, shall provide Officer a level of compensation comparable to
compensation generally prevailing for other chief executive officers of publicly
traded companies which are comparable to the Company. The factors to be used to
select which companies are comparable to that of the Company shall include, but
not be limited to, industry group, revenues, operating income, growth rate,
number of employees and location. The annual performance goals to be met (the
"Annual Performance Goal") in order to earn portions or all of the bonus
provided under the plan shall be determined through consultation between the
Officer and the Compensation Committee. If requested by the Compensation
Committee or Officer, the Company shall retain a reputable, nationally

                                       2

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recognized compensation consultant to assist the Compensation Committee in
identifying comparable companies and to make recommendations regarding the
structure and amount of the cash bonus plan. The amount of the cash bonus for
any particular calendar year shall be determined as follows: (i) if Officer
substantially achieves the Annual Performance Goal for such calendar year,
Officer shall receive a cash bonus of at least 50% of the Officer's Base Salary
for such calendar year; and (ii) if Officer exceeds the Annual Performance Goal
for such calendar year, Officer shall receive a cash bonus between 50% and 100%
of the Officer's Base Salary for such calendar year. If this Amended Agreement
is terminated in the middle of a calendar year, Officer shall receive a cash
bonus for services rendered through the Termination Date (as defined below)
equal to the cash bonus he would have received for the entire calendar year, pro
rated through the Termination Date. All cash bonuses hereunder shall be paid to
Officer within five business days following the date the audited consolidated
financial statements for the Company for the applicable calendar year become
available.

        4.3 Stock Options. All options granted to Officer after the Effective
            -------------
Date, whether pursuant to a Company Stock Option Plan or otherwise, shall vest
in 24 equal monthly installments commencing on the first day of each month
following the month in which such options are granted. All options to purchase
the Company's Common Stock currently outstanding or which may be granted to
Officer whether pursuant to a Company Stock Option Plan or otherwise and
notwithstanding the provisions of any other agreement to the contrary, may be
exercised by Officer or by Officer's family by delivery of a promissory note in
the amount of the total exercise price of the option (the "Exercise Price"). The
promissory note shall bear interest at the then current thirty year U.S.
treasury bond rate, shall be nonrecourse except to the security referred to in
the following clause, shall be secured by the Common Stock of the Company so
purchased, and shall be payable in full (principal and interest) on the fourth
anniversary of the date of the purchase of the shares. Notwithstanding the
foregoing, Officer shall apply all proceeds from the sale of the shares so
purchased by delivery of a promissory note to the repayment of principal and
interest outstanding under the note until all principal and interest is paid in
full. The Company shall maintain an effective registration statement covering
the shares underlying the options granted to Officer whether pursuant to a
Company Stock Option Plan or otherwise.

        4.4 Benefits.
            --------

            4.4.1 Vacation. Officer shall be entitled to five weeks paid
                  --------
vacation for each calendar year during Officer's employment; provided, however,
that vacation shall only be taken at such times as not to interfere with the
necessary performance of Officer's duties and obligations under this Amended
Agreement.

            4.4.2 Automobile. The Company shall provide Officer with the use of
                  ----------
a luxury automobile that is selected by Officer and approved by the Compensation
Committee, the cost (the "Automobile Cost") of which during the first year of
the Term shall not be less than the cost that the Company currently provides for
Officer's use of an automobile. Commencing January 1, 2002 and continuing
annually thereafter, the Automobile Cost may, at Officer's sole discretion, be
increased 5% per annum. On the earlier of significant damage or destruction or
attaining two years of age, the Company shall replace such automobile with a new
automobile selected by Officer and approved by the Compensation Committee. The
Company shall pay all

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costs of insurance, repair, maintenance and operation of such automobile. At the
end of the two year period referred to herein (or termination of employment, if
earlier), Officer may, but is not obligated to, purchase the automobile for the
book value of the automobile on the Company's financial records.

            4.4.3 Club Memberships. The Company shall reimburse Officer for the
                  ----------------
initiation and monthly dues for Officer's membership in two health clubs and one
country club selected by Officer, provided the aggregate of such dues shall not
exceed $1,500 per month during the first year of the Term. Commencing January 1,
2002, and continuing annually thereafter, such monthly dues may, at Officer's
sole discretion, increase 5% per annum.

            4.4.4 Other Benefits; Insurance. During the term of Officer's
                  -------------------------
employment under this Amended Agreement, if and to the extent eligible, Officer
shall be entitled to participate in all operative Officer benefit and welfare
plans of the Company then in effect ("Company Officer Benefit Plans"),
including, to the extent then in effect, group life, medical, disability and
other insurance plans, all on the same basis generally applicable to the
executives of the Company; provided, however, that nothing contained in this
Section 4.4.4 shall, in any manner whatsoever, directly or indirectly, require
or otherwise prohibit the Company from amending, modifying, curtailing,
discontinuing or otherwise terminating, any Company Officer Benefit Plan at any
time (whether during or after the Term) except that the Company will at all
times during the Term and any severance period referred to in Section 8 or 9
hereof maintain medical insurance (including Exec-U-Care Medical Reimbursement
Insurance or a substantially similar policy) covering Officer and his dependents
with benefits at least as favorable as those provided by the Company to its
executives as of the date of termination. In addition to, and not in lieu of,
any Company Officer Benefit Plan available to Officer during the Term of
Officer's employment hereunder, the Company shall provide Officer supplemental
retirement benefits pursuant to a "Supplemental Executive Retirement Program,"
the terms of which shall be mutually agreed to by Officer and the Company.

            4.4.5 Entertainment. The Company shall reimburse Officer for the
                  -------------
cost of entertainment provided by Officer to the Company's customers, vendors,
employees and strategic partners, provided the aggregate of such annual cost
does not exceed $200,000 per annum during the first year of the Term. Commencing
January 1, 2002 and continuing annually thereafter, the cost of entertainment
may, at Officer's sole discretion, be increased 5% per annum.

            4.4.6 Reimbursement. Officer shall be entitled to reimbursement from
                  -------------
the Company for the reasonable costs and expenses incurred in connection with
the performance of the duties and obligations provided for in this Amended
Agreement. The Company shall provide Officer reimbursement for the cost of an
apartment in the Borough of Manhattan, provided the aggregate of such cost does
not exceed $2,000 per month during the first year of the Term. Commencing
January 1, 2002, and continuing annually thereafter, such monthly cost of an
apartment in the Borough of Manhattan may, at Officer's sole discretion,
increase 5% per annum. Additionally, Officer shall be entitled to reimbursement
for reasonable attorneys fees incurred in connection with the receipt of advice
from attorneys, accountants or financial planners regarding the exercise of
stock options to purchase common stock of the Company and other compensation
related issues not to exceed $12,000 per calendar year. Reimbursement shall

                                       4

<PAGE>

be paid upon prompt presentation of expense statements or vouchers and such
other supporting information as the Company may from time to time require.

     5. INDEMNIFICATION.
        ---------------

     The Company and Officer are parties to an Indemnification Agreement,
pursuant to which, inter alia, the Company has agreed, on the terms and
conditions therein set forth, to indemnify Officer against certain claims
arising by reason of the fact that he is or was an officer or director of the
Company.

     6. TRADE SECRETS.
        -------------

     Officer will not at any time during the Term and for the three year period
thereafter, in any fashion, form, or manner, unless specifically consented to in
writing by the Company, either directly or indirectly use or divulge, disclose
or communicate to any person, firm or corporation, any confidential information
of any kind, nature or description concerning any matters affecting or relating
to the business of the Company, except in the ordinary course of the Company's
business. All equipment, notebooks, documents, memoranda, report, files,
samples, books, correspondence, lists, other written and graphic records, and
the like, affecting or relating to the business of the Company, which Officer
shall prepare, use, construct, observe, possess or control, shall be and remain
the Company's sole property. Officer's obligation under the preceding sentence
shall continue in effect after the end of Officer's employment with the Company
and the obligations shall be binding on Officer's assigns, heirs, executors,
administrators, and other legal representatives.

     7. RETURN OF CORPORATE PROPERTY AND TRADE SECRETS.
        ----------------------------------------------

     Upon termination of this Amended Agreement for any reason, Officer, or his
estate in the event of his death, shall turn over to the Company all
correspondence, property, writings or documents then in his possession or
custody belonging to or relating to the affairs of the Company or any of its
subsidiaries or affiliates or comprising or relating to the Trade Secrets.

     8. TERMINATION OF EMPLOYMENT.
        -------------------------

        8.1 Termination in Case of Death.
            ----------------------------

            8.1.1 Officer's employment hereunder shall terminate immediately
upon the death of Officer.

            8.1.2 Upon termination of Officer's employment pursuant to this
Section 8.1, the Company shall pay to Officer's estate, on the Termination Date,
a lump sum payment of an amount equal to (x) all accrued and unpaid salary and
other compensation payable to Officer by the Company and all accrued and unused
vacation and sick pay payable to Officer by the Company with respect to services
rendered by Officer to the Company through the Termination Date, and (y) the
amount Officer would have earned as Base Salary during the remaining scheduled
Term of the Amended Agreement (computed without regard to the termination of the
Amended Agreement pursuant to this Section 8.1). In addition to the foregoing,
and notwithstanding the provisions of any other agreement to the contrary, (x)
all options to purchase

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the Common Stock of the Company which have been granted to Officer and which
would have vested during the 24 months following the Termination Date shall
become immediately exercisable on the Termination Date and, notwithstanding any
other agreement to the contrary, shall remain exercisable for the full term of
each such option, and (y) the Company shall continue to provide for the benefit
of Officer's family the medical benefits referred to in Section 4.4.4 hereof for
the remaining scheduled Term of the Amended Agreement (computed without regard
to the termination of the Amended Agreement pursuant to this Section 8.1).

                8.2      Termination in Case of Disability.
                         ---------------------------------

                8.2.1 If Officer suffers a physical or mental disability which
results in Officer being unable to perform his duties hereunder for a 26
consecutive week period, then the Board of Directors shall select a qualified
physician to examine Officer and review his physical and mental capacity. If
such physician determines in good faith that such physical or mental disability
renders Officer incapable of performing his duties hereunder for a period of at
least 26 consecutive weeks following the date of such physician's written
opinion, then Officer's employment shall terminate effective 26 weeks following
the date of such physician's written opinion.

                8.2.2 Upon termination of Officer's employment pursuant to this
Section 8.2, the Company shall pay to Officer, on the Termination Date, a lump
sum payment of an amount equal to (x) all accrued and unpaid salary and other
compensation payable to Officer by the Company and all accrued and unused
vacation and sick pay payable to Officer by the Company with respect to services
rendered by Officer to the Company through the Termination Date, and (y) the
amount Officer would have earned as Base Salary during the remaining scheduled
Term of the Amended Agreement (computed without regard to the termination of the
Amended Agreement pursuant to this Section 8.2); provided, however, such amount
shall be reduced by the amount of any payments to be paid to Officer under any
long-term disability insurance policy maintained by the Company for the benefit
of Officer pursuant to Section 4.4.4. In addition to the foregoing, and
notwithstanding the provisions of any other agreement to the contrary, (x) all
options to purchase the Common Stock of the Company which have been granted to
Officer and which would have vested during the 24 months following the
Termination Date shall become immediately exercisable on the Termination Date
and, notwithstanding any other agreement to the contrary, shall remain
exercisable for the full term of each such option, and (y) the Company shall
continue to provide to Officer all other benefits referred to in Sections 4.4.2,
4.4.3 and 4.4.4 hereof for the remaining scheduled Term of the Amended Agreement
(computed without regard to the termination of the Amended Agreement pursuant to
this Section 8.2).

                8.3      Termination by Officer for Cause.
                         --------------------------------

                8.3.1 The employment of Officer hereunder shall terminate
immediately upon written notice delivered by Officer to the Company upon the
occurrence of any of the following events:

                                     6

<PAGE>
                8.3.1.1 The willful breach of any of the material obligations of
the Company to Officer under this Amended Agreement following written notice
delivered to the Company and a reasonable cure period not to exceed 30 days.

                8.3.1.2  The Company's chief executive offices are moved to a
location outside of Los Angeles County, California; or

                8.3.1.3  Officer fails to be reelected to, or is removed from,
the Board of Directors of the Company.

                8.3.2 Upon termination of Officer's employment pursuant to this
Section 8.3, the Company shall pay to Officer, on the Termination Date, a lump
sum payment of an amount equal to (x) all accrued and unpaid salary and other
compensation payable to Officer by the Company and all accrued and unused
vacation and sick pay payable to Officer by the Company with respect to services
rendered by Officer to the Company through the Termination Date, and (y) the
amount Officer would have earned as Base Salary during the remaining scheduled
Term of the Amended Agreement (computed without regard to the termination of the
Amended Agreement pursuant to this Section 8.3), plus an amount equal to five
times (i) in the event no previous bonus has been paid or is payable pursuant to
this Amended Agreement, 20% of Officer's Base Salary, or (ii) in the event at
least one bonus has been paid or is payable to Officer, the greater of (a) the
last annual bonus paid or payable to Officer pursuant to this Amended Agreement;
and (b) the average annual bonus based on all annual bonuses paid or payable to
Officer pursuant to this Amended Agreement. In addition to the foregoing, and
notwithstanding the provisions of any other agreement to the contrary, (x) all
options to purchase the Common Stock of the Company which have been granted to
Officer shall become immediately exercisable on the Termination Date and,
notwithstanding any other agreement to the contrary, shall remain exercisable
for the full term of each such option, and (y) the Company shall continue to
provide to Officer all other benefits that would otherwise be payable to Officer
pursuant to Sections 4.4.2, 4.4.3 and 4.4.4 hereof for the remaining scheduled
Term of the Amended Agreement (computed without regard to the termination of the
Amended Agreement pursuant to this Section 8.3).

                8.4      Termination by Officer Without Cause.
                         ------------------------------------

                8.4.1 This Amended Agreement shall terminate immediately upon
delivery to the Company of written notice of termination by Officer without
cause.

                8.4.2 Upon termination of this Amended Agreement pursuant to
this Section 8.4, the Company shall pay to Officer, on the Termination Date, a
lump sum payment of an amount equal to all accrued and unpaid salary and other
compensation payable to Officer by the Company and all accrued and unused
vacation and sick pay payable to Officer by the Company with respect to services
rendered by Officer to the Company through the Termination Date.

                8.5      Termination by the Company Without Cause.
                         ----------------------------------------

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<PAGE>

        8.5.1 The employment of Officer shall terminate immediately upon
delivery to Officer of written notice of termination by the Company, which shall
be deemed to be "without cause" unless termination is expressly stated to be
pursuant to Sections 8.1 or 8.2.

        8.5.2 Upon termination of this Officer's employment pursuant to this
Section 8.5, the Company shall pay to Officer, on the Termination Date, a lump
sum payment of an amount equal to (x) all accrued and unpaid salary and other
compensation payable to Officer by the Company and all accrued and unused
vacation and sick pay payable to Officer by the Company with respect to services
rendered by Officer to the Company through the Termination Date, and (y) the
amount Officer would have earned as Base Salary during the remaining scheduled
Term of the Amended Agreement (computed without regard to the termination of the
Amended Agreement pursuant to this Section 8.5), plus an amount equal to five
times (i) in the event no previous bonus has been paid or is payable pursuant to
this Amended Agreement, 20% of Officer's Base Salary, or (ii) in the event at
least one bonus has been paid or is payable to Officer, the greater of (a) the
last annual bonus paid or payable to Officer pursuant to this Amended Agreement;
and (b) the average annual bonus based on all annual bonuses paid or payable to
Officer pursuant to this Amended Agreement. In addition to the foregoing, and
notwithstanding the provisions of any other agreement to the contrary, (x) all
options to purchase the Common Stock of the Company which have been granted to
Officer shall become immediately exercisable on the Termination Date and,
notwithstanding any other agreement to the contrary, shall remain exercisable
for the full term of each such option, and (y) the Company shall continue to
provide to Officer all other benefits that would otherwise be payable to Officer
pursuant to Sections 4.4.2, 4.4.3 and 4.4.4 hereof for the remaining scheduled
Term of the Amended Agreement (computed without regard to the termination of the
Amended Agreement pursuant to this Section 8.5).

        8.6      Termination by the Company For Cause.
                 ------------------------------------

        8.6.1 The employment of Officer hereunder shall terminate immediately
upon written notice delivered by the Company to the Officer of termination for
"cause" by reason of Officer's conviction (including any plea of guilty or no
contest) of (x) any felony involving the embezzlement, theft or misappropriation
of monies or other property, of the Company or otherwise, or (y) any crime of
moral turpitude.

        8.6.2 Upon termination of this Amended Agreement pursuant to this
Section 8.6, the Company shall pay to Officer, on the Termination Date, all
accrued and unpaid salary and other compensation payable to Officer by the
Company and all accrued and unused vacation and sick pay payable to Officer by
the Company with respect to services rendered by the Officer to the Company
through the Termination Date in a lump sum payment. The Company shall have no
further obligation to the Officer pursuant to this Amended Agreement.

        8.7 Termination Date. For purposes of this Section 8, the term,
            ----------------
"Termination Date" shall mean that date on which Officer's employment is
terminated pursuant to this Section 8.

        9.  SEVERANCE PAYMENTS UPON CHANGE IN CONTROL.
            -----------------------------------------

                                       8

<PAGE>

        9.1 Severance Payment. Upon the occurrence of a Change in Control (as
            -----------------
defined in Section 9.5 below) of the Company, the employment of Officer
hereunder shall terminate and the Company, in lieu of any payment otherwise due
under Section 8 hereof, shall pay to Officer in cash, on the fifth day following
the date on which the Change of Control occurs (which for the purposes of this
Section 9 shall be the Termination Date), the following:

        9.1.1 All accrued and unpaid salary and other compensation payable to
Officer by the Company for services rendered by Officer to the Company through
the Termination Date;

        9.1.2 All accrued and unused vacation and sick pay payable to Officer by
the Company with respect to services rendered by Officer to the Company through
the Termination Date; and

        9.1.3 Severance pay in an amount equal to (x) the Base Salary Officer
would have earned during the remaining scheduled Term of the Amended Agreement
(computed without regard to the Change in Control described in this Section 9),
plus an amount equal to five times (y) (i) in the event no previous annual bonus
has been paid or is payable pursuant to this Amended Agreement, 20% of Officer's
Base Salary, or (ii) in the event at least one annual bonus has been paid or is
payable to Officer, the greater of (a) the last annual bonus paid or payable to
Officer pursuant to this Amended Agreement, or (b) the average annual bonus
based on all annual bonuses paid or payable to Officer pursuant to this Amended
Agreement.

        9.2 Continuation of Benefits. The Company shall continue for the
            ------------------------
remaining scheduled Term of the Amended Agreement (computed without regard to
the Change in Control described in this Section 9), to provide Officer with all
benefits that would have been payable to him pursuant to Sections 4.4.2, 4.4.3
and 4.4.4 hereof if Officer had been employed by the Company during such period.

        9.3 Vesting of Options. In addition to the foregoing, and
            ------------------
notwithstanding the provisions of any other agreement to the contrary, upon the
occurrence of a Change in Control, all options to purchase Common Stock of the
Company which have been granted to Officer by the Company shall become
immediately exercisable on the Termination Date and, notwithstanding any other
agreement to the contrary, shall remain exercisable for the full term of each
such option.

        9.4 Provision of Services Following Change in Control. At the request of
            -------------------------------------------------
the Company, Officer shall continue to serve hereunder for a period of up to 180
days following the Termination Date. If the Company requests Officer to perform
such services, Officer shall be compensated from and after the Termination Date
for the period that Officer actually remains employed by the Company at his then
current Base Salary. Any such amounts payable to Officer shall be in addition to
and not in lieu of the amounts payable to Officer under Section 9.1 above. Upon
the later to occur of an occurrence of a Change of Control or the termination of
any period during which Officer continues to provide services as aforesaid,
Officer's employment hereunder shall terminate.

                                       9

<PAGE>

           9.5    Change in Control. For purposes of this Section 9, "Change in
                  -----------------
Control" of the Company shall be deemed to have occurred if (a) there shall be
consummated (x) any consolidation or merger of the Company into or with another
Person as such term is used in Sections 13(d)(3) and 14(d)(2) of the Securities
and Exchange Act of 1934, as amended (the "Exchange Act"), in which the Company
is not the continuing or surviving corporation or pursuant to which shares of
the Company's common stock would be converted into cash, securities or other
property, other than a merger of the Company in which the holders of the
Company's common stock immediately prior to the merger have the same
proportionate ownership of common stock of the surviving corporation immediately
after the merger, or (y) any sale, lease or other transfer (in one transaction
or a series of related transactions) of all or a significant portion of the
assets of the Company (for purposes of this definition, the sale of the stock or
assets of two or more of the Company's existing subsidiaries shall be deemed to
be a sale of a significant portion of the Company's assets), or (b) the
shareholders of the Company approve any plan or proposal for the liquidation or
dissolution of the Company, or (c) any Person who is not now the owner of 10% or
more of the Company's outstanding equity securities shall become the beneficial
owner (within the meaning of Rule 13d-3 under the Exchange Act) of 20% or more
of the Company's outstanding equity securities, or (d) during any period of two
consecutive years, individuals who at the beginning of such period constitute
the entire board of directors shall cease for any reason to constitute a
majority thereof unless the election, or the nomination for election by the
Company's shareholders, of each new director was approved by a vote of at least
two-thirds of the directors then still in office who were directors in the
beginning of the period.

           The parties believe that the payments pursuant to Sections 8 and 9
hereof do not constitute "Excess Parachute Payments" under Section 280G of the
Internal Revenue Code of 1986, as amended (the "Code"). Notwithstanding such
belief, if any benefit under these sections constitutes an "Excess Parachute
Payment" the Company shall pay to Officer an additional amount ("Tax Payment")
such that (x) the excess of all Excess Parachute Payments (including payments
under this sentence) over the sum of excise tax thereon under Section 4999 of
the Code and income tax thereon under Subtitle A of the Code and under
applicable state law is equal to (y) the excess of all Excess Parachute Payments
(excluding payments under this sentence) over income tax thereon under Subtitle
A of the Code and under applicable state law. Such Tax Payment shall be paid to
Officer concurrently with the severance payment referred to in Section 9.1
above.

           10.    NO MITIGATION.
                  -------------

           The payments required to be paid to Officer by Company pursuant to
Sections 8 and 9 shall not be reduced by or mitigated by amounts which Officer
earns or is capable of earning during any period following his Termination Date.

           11.    INJUNCTIVE RELIEF.
                  -----------------

           Officer hereby recognizes, acknowledges and agrees that in the event
of any breach by Officer of any of his covenants, agreements, duties or
obligations hereunder, the Company would suffer great and irreparable harm,
injury and damage, the Company would encounter extreme difficulty in attempting
to prove the actual amount of damages suffered by the Company as a

                                       10

<PAGE>

result of such breach, and the Company would not be reasonably or adequately
compensated in damages in any action at law. Officer therefore agrees that, in
addition to any other remedy the Company may have at law, in equity, by statute
or otherwise, in the event of any breach by Officer of any of the covenants,
agreements, duties or obligations hereunder, the Company or its subsidiaries
shall be entitled to seek and receive temporary, preliminary and permanent
injunctive and other equitable relief from any court of competent jurisdiction
to enforce any of the rights of the Company or its subsidiaries or any of the
covenants, agreements, duties or obligations of Officer hereunder, or otherwise
to prevent the violation of any of the terms or provisions hereof, all without
the necessity of proving the amount of any actual damage to the Company or its
subsidiaries thereof resulting therefrom; provided, however, that nothing
contained in this Section 11. shall be deemed or construed in any manner
whatsoever as a waiver by the Company or its subsidiaries of any of the rights
which any of them may have against Officer at law, in equity, by statute or
otherwise arising out of, in connection with or resulting from the breach by
Officer of any of his covenants, agreements, duties or obligations hereunder.

     12.  MISCELLANEOUS.
          -------------

          12.1 Entire Agreement. This Amended Agreement contains the entire
               ----------------
understanding of the parties hereto relating to the subject matter hereof and
cannot be changed or terminated except in writing signed by both Officer and the
Company.

          12.2 Limited Liabilities. All liabilities incurred by Officer in his
               -------------------
capacity as an officer hereunder shall be incurred for the account of the
Company, and Officer shall not be personally liable therefor. Officer shall not
be liable to the Company, or any of its respective subsidiaries, affiliates,
employees, officers, directors, agents, representatives, successors, assigns,
stockholders, and their respective subsidiaries and affiliates, the Company
shall, and hereby agrees to, indemnify, defend and hold Officer harmless from
and against any and all damages and/or loss or liability (including, without
limitation, all costs of defense thereof), for any acts or omissions in the
performance of service under and within the scope of this Amended Agreement on
the part of Officer.

          12.3 Notices. All notices, requests and other communications
               -------
(collectively, "Notices") given pursuant to this Amended Agreement shall be in
writing, and shall be delivered by facsimile transmission with a copy delivered
by personal service or by United States first class, registered or certified
mail (return receipt requested), postage prepaid, addressed to the party at the
address set forth below:

     If to the Company:    VCA Antech, Inc.
                           12401 West Olympic Boulevard
                           Los Angeles, CA 90064-1022
                           Attention: Board of Directors
                           Facsimile No.: (310) 571-6701

     If to Officer:        Robert L. Antin

                           _____________________________

                           _____________________________

                                       11

<PAGE>

     Any Notice shall be deemed duly given when received by the addressee
thereof, provided that any Notice sent by registered or certified mail shall be
deemed to have been duly given three days from date of deposit in the United
States mails, unless sooner received. Either party may from time to time change
its address for further Notices hereunder by giving notice to the other party in
the manner prescribed in this Section 12.3.

          12.4 Governing Law. This Amended Agreement has been made and entered
               -------------
into in the state of California and shall be construed in accordance with the
laws of the State of California without regard to the conflict of laws
principles thereof.

          12.5 Counterparts. This Amended Agreement may be executed in any
               ------------
number of counterparts, each of which shall be deemed to be an original, but all
of which together shall constitute one and the same instrument.

          12.6 Severable Provisions. The provisions of this Amended Agreement
               --------------------
are severable, and if any one or more provisions are determined to be judicially
unenforceable, in whole or in part, the remaining provisions shall nevertheless
be binding and enforceable.

          12.7 Successors and Assigns. This Amended Agreement and all
               ----------------------
obligations and benefits of Officer and the Company hereunder shall bind and
inure to the benefit of Officer and the Company, their respective affiliates,
and their respective successors and assigns.

          12.8 Amendments and Waivers. No amendment or waiver of any term or
               ----------------------
provision of this Amended Agreement shall be effective unless made in writing.
Any written amendment or waiver shall be effective only in the instance given
and then only with respect to the specific term or provision (or portion
thereof) of this Amended Agreement to which it expressly relates, and shall not
be deemed or construed to constitute a waiver of any other term or provision (or
portion thereof) waived in any other instance.

          12.9 Title and Headings. The titles and headings contained in this
               ------------------
Amended Agreement are included for convenience only and form no part of the
agreement between the parties.

          12.10 Survival. Notwithstanding anything to the contrary contained
                --------
herein, the provisions of Sections 6, 7, 8, 9, 10 and 11 shall survive the
termination of this Amended Agreement.

     IN WITNESS WHEREOF, this Amended Agreement has been executed as of the
date first set forth above.

                                           "THE COMPANY" VCA ANTECH, INC.

                                           By:__________________________________

                                           Its:_________________________________

ACCEPTED AND AGREED TO:

                                       12

<PAGE>

---------------------
Robert L. Antin

                                       13

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