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                                                                 Exhibit 10.79.2
                                                                 ---------------

DATE:   March 15, 2001

TO:     Paul Rosinack

FR:     Kenneth M. Cohen

RE:     Increased Retention Plan Cash Bonus Opportunity

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As you know, under the Company's retention plan you have been entitled to
receive a cash retention bonus if the Company or its animal health business is
sold and you remain employed by the company at the time of the sale.

At its February 14, 2001 meeting, the Board of Directors decided to increase
your potential cash bonus benefit from the retention plan by doubling the amount
you would receive, including a doubling of the minimum payment from 50% to 100%.
This recognizes your contributions to date, the value you are expected to create
for the shareholders in continuing to work toward a sale, and the diminution in
the expected value of the stock option component of the retention plan.

Whether or not you have a written employment agreement, please note that (except
to the extent expressly provided in a written employment agreement) the Company
and you each retain the right to unilaterally terminate the employment
relationship at any time, for any reason or for no reason; neither the original
retention plan nor this augmentation of it changes that.<PAGE>

                                                                 Exhibit 10.79.3
                                                                 ---------------

                      AMENDMENT TO RETENTION PLAN AGREEMENT

         This Amendment (the "Amendment") is entered into as of January 4, 2002
between Synbiotics Corporation ("Synbiotics") and the undersigned employee of
Synbiotics or its subsidiary ("Employee").

         A.  Synbiotics and Employee are parties to a written retention plan
agreement, as amended (the "Retention Plan Agreement"), under which Synbiotics
promised, on the day following the sale of Synbiotics' animal heath business, to
(i) make a cash bonus payment to Employee and (ii) accelerate the vesting and
provide a fixed exercisability period of all stock options issued to Employee.

         B.  Synbiotics is working toward entering into a Stock Purchase
Agreement with Redwood West Coast, LLC ("Redwood"), under which Redwood would
make an investment in Synbiotics stock (the "Stock Purchase Agreement").
Synbiotics has determined that a closing under the Stock Purchase Agreement
would constitute the sale of Synbiotics' animal health business and entitle the
Employee to a cash payment of $233,128.44 (the "Retention Plan Cash Amount")
under the Retention Plan Agreement.

         C.  Redwood requires Employee and Synbiotics to enter into this
Amendment before Redwood will enter into the Stock Purchase Agreement.

         D.  Synbiotics and Employee desire to amend the Retention Plan
Agreement to provide that Synbiotics will issue to Employee 1,295,268 fully
vested, fully paid and nonassessable shares of common stock of Synbiotics (the
"New Shares") pursuant to the Synbiotics 1995 Stock Option/Stock Issuance Plan,
as amended (the "1995 Plan") instead of paying the Retention Plan Cash Amount.

         E.  Employee is willing separately to agree to forfeit any and all of
Employee's options to purchase stock of Synbiotics, in exchange for Synbiotics
making (and not seeking reimbursement from Employee for) certain tax withholding
amounts for and on behalf of Employee.

         NOW, THEREFORE:

         1.  Synbiotics and Employee hereby agree that if and only if Synbiotics
and Redwood enter into the Stock Purchase Agreement, the Retention Plan
Agreement is hereby amended (as of immediately before the closing under the
Stock Purchase Agreement (the "Stock Purchase Closing")) by:

             1.1  deleting the paragraph captioned "Cash Bonus" in its entirety
and replacing such paragraph with the following:

             "The Company will issue to you on or before May 15, 2002, 1,295,268
fully vested, fully paid and nonassessable shares of common stock of the Company
pursuant to the Company's 1995 Stock Option/Stock Issuance Plan, as amended."

             1.2  deleting the paragraph captioned "Restricted Stock and Stock
Options" in its entirety.

         2.  Employee represents and warrants to Synbiotics as follows:

             2.1  Employee is acquiring the New Shares for Employee's own
account and not with a view to or for sale in connection with any distribution
of the New Shares.

             2.2  Employee acknowledges that Employee has received a copy of the
Prospectus of Synbiotics dated as of January 4, 2002. Employee has received all
the information Employee considers necessary or appropriate for deciding whether
to sign this Amendment and acquire the New Shares.

<PAGE>

        3.  The value of the New Shares will be taxable income to Employee.
Withholding taxes must be paid to Federal and State tax authorities. Synbiotics
agrees to pay any and all tax withholding amounts required to be paid by
Synbiotics and/or by Employee arising out of or in connection with the issuance
of the New Shares (except for "secondary" employee-side withholdings, if any,
associated with the "primary" employee-side withholding payments made by
Synbiotics on behalf of Employee), and without any requirement for Employee to
repay Synbiotics for the withholding. Withholdings paid by Synbiotics on behalf
of Employee count as "taxes paid" on Employee's 2002 Federal and State income
tax returns. In exchange for this tax withholding benefit, Employee agrees to
and hereby does (effective immediately before the Stock Purchase Closing)
terminate and forfeit, without the need for further action by any party, any and
all of Employee's options to purchase capital stock of Synbiotics. Synbiotics
has no obligation with regard to any further or other taxes of Employee.

        4.  Even if Employee's employment is terminated for any reason prior to
May 15, 2002, Employee will still be entitled to receive the New Shares on May
15, 2002.

        5.  All of the terms and provisions of the Retention Plan Agreement as
amended hereby remain in full force and effect. However, Employee confirms that
upon Redwood's January 2002 investment under the Stock Purchase Agreement, the
Retention Plan Agreement (as amended hereby) is terminated except for
Synbiotics' obligations arising from such January 2002 Redwood investment.

                                 EMPLOYEE

                                 /s/ Paul A. Rosinack
                                 -------------------------------------
                                 Name: Paul A. Rosinack
                                 -------------------------------------

                                 SYNBIOTICS CORPORATION

                                 By: /s/ Michael K. Green
                                     ---------------------------------
                                     Michael K. Green, Senior Vice President &
                                     C.F.O.<PAGE>

                                                                   Exhibit 10.80
                                                                   -------------

                            MANAGEMENT RETENTION PLAN

Synbiotics Corporation is implementing a "management retention plan" designed to
encourage you to remain an employee of the Company between now and the potential
sale of the Animal Health Business. The Management Retention Plan consists of a
cash or stock bonus and special treatment of outstanding stock options and
restricted stock. This Management Retention Plan does not alter or affect
existing Synbiotics employee benefit plans, the Special Payment Plan or existing
employee agreements.

To qualify for the Management Retention Plan, you must be an active employee,
who is employed on the day of the sale of the Animal Health Business, provided
that you have not notified the Company of your intent to resign your employment
with Synbiotics. This Management Retention Plan does not apply to:
                                                     ---

1)   Employees who voluntarily leave the Company prior to the sale of the Animal
     Health Business

2)   Employees whose employment is terminated prior to the sale of the Animal
     Health Business

3)   Employees of W3COMMERCE

4)   Active employees who are offered and accept continued employment with the
     Company following the sale of the Animal Health Business.

Cash Bonus

A cash bonus payment (or you can elect to receive the cash bonus in stock - see
below) will be made on the day following the sale of the Animal Health Business.
The bonus payment will depend on the ultimate sales price of the Animal Health
Business and will be paid as a percentage of annual base salary ("the
Percentage"). In no event will the Percentage payment be less than 25% of an
employee's annual base salary and there is no maximum percentage. The Percentage
will be calculated as 1.25 times the sales price of the Animal Health Business.

     Examples:

     If the sales price of the Animal Health Business were $35 million, then 35
times 1.25 would yield a Percentage of 43.75%. You would receive a cash bonus of
43.75% of your annual salary.

     If the sales price of the Animal Health Business were $60 million then 60
times 1.25 would yield a Percentage of 75%. You would receive a cash bonus of
75% of your annual salary.

<PAGE>

Stock Bonus In-lieu of Cash Bonus

You may elect to receive all or a part of the aforementioned cash bonus in
stock. Such election must be made within 30 days from the execution date of this
agreement. If you choose to receive part of your cash bonus in stock, then the
number of shares to be received will be determined by dividing the cash bonus by
$3.

         Example:

         If your cash bonus were $100, 000 and you elected to receive $60, 000
of it in Stock, you would receive $40,000 in cash and 20,000 ($60.000/$3) shares
of Synbiotics stock.

Notwithstanding paragraph 4 above, if you are offered and accept employment with
the Company following the sale of the Animal Health Business you will receive
the equivalent of the cash bonus in "Synbiotics restricted stock" calculated by
dividing the cash bonus by $3.

Restricted Stock and Stock Options

All of your unvested restricted stock and stock options will become fully vested
on the day following the sale of the Animal Health Business and you will receive
two years following the sale of the Animal Health Business to exercise any
unexercised stock options.

/s/ Kenneth Cohen
----------------------
Kenneth Cohen
President and CEO
Synbiotics Corporation

I have read the above Management Retention Plan.
Acknowledged and accepted:

Michael Green                    /s/ Michael Green
-------------                    -----------------
Print Name                       Employee Signature

July 12, 2000
-------------
Date

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