Document:

<PAGE>   1
                                                                   EXHIBIT 10.40

                              EMPLOYMENT AGREEMENT

THIS EMPLOYMENT AGREEMENT ("Agreement") is entered into by and between Heska
Corporation, a Delaware corporation with its principal office at 1613 Prospect
Parkway, Fort Collins, Colorado 80525 ("Company") and DAN T. STINCHCOMB
("Employee"), effective as of MAY 1, 2000.

                              W I T N E S S E T H:

Whereas Company desires to employ Employee to act as its EXECUTIVE VICE
PRESIDENT, RESEARCH AND DEVELOPMENT in an at-will capacity; and

Whereas Employee wishes to act as Company's EXECUTIVE VICE PRESIDENT, RESEARCH
AND DEVELOPMENT as an employee in an at-will capacity;

NOW, THEREFORE, in consideration of the mutual covenants and warranties
contained herein, the parties agree as follows:

1. Employment. Company hereby employs Employee as its EXECUTIVE VICE PRESIDENT,
RESEARCH AND DEVELOPMENT, and Employee hereby accepts such employment.

2. Duties and Responsibilities. Employee shall serve as EXECUTIVE VICE
PRESIDENT, RESEARCH AND DEVELOPMENT of Company, with such duties and
responsibilities as may be assigned to HIM from time to time by HIS superior
officers (the "Senior Management") and/or the Board of Directors of Company, and
with such on-going daily duties and responsibilities as are typically entailed
in such position. The Senior Management and/or the Board of Directors shall be
entitled to change such title, duties and responsibilities from time to time, in
their discretion. Employee shall devote HIS full time and energies to such
duties.

3. Compensation. Company shall pay Employee, as compensation for services
rendered under this Agreement, a "base salary" per year, the amount of which
shall initially be $180,000, which may be increased from time-to-time by the
Company in its discretion. If for any reason during any given year, Employee
does not work an entire year, other than normal vacations as provided hereunder,
the compensation will be prorated to compensate only for the actual time worked.

4. Expenses. Company shall reimburse Employee for HIS reasonable out-of-pocket
expenses incurred in connection with the business of Company, including travel
away from the Company's facilities, upon presentation of appropriate written
receipts and reports and subject to the customary practices and limitations of
Company.

5. Employee Benefits. During the term of HIS employment hereunder, Employee
shall be entitled to receive the same benefits that the Board of Directors
establishes generally for the officers and other employees of Company. These may
include, from time to time, medical insurance, life insurance, paid vacation
time and medical disability insurance.

                                      -1-
<PAGE>   2

6. Termination.

         (a)      At-Will. This is an at-will employment agreement and does not
         bind either of the parties to any specific term or duration.

                  (i) Employee is free to terminate employment with Company at
                  any time, for any reason, or for no reason, for cause or
                  without cause, and without any prior notice.

                  (ii) Company is free to terminate the employment of Employee
                  at any time, for any reason or for no reason, for cause or
                  without cause, and without any prior notice.

         (b)      Termination "Without Cause" - Separation Benefits.

                  (i) Upon "involuntary termination" of HIS employment with
                  Heska Corporation for other than a "change of control", as
                  defined in Paragraph 6(c)(iii) below, Employee will be
                  entitled to severance pay as provided in Paragraph 6(b)(ii)
                  below, unless HE is terminated for "cause", as defined in
                  Paragraph 6(d)(ii) below. Employee's entitlement to any
                  severance pay is dependent on HIS execution of a complete
                  release of claims against Company and its affiliates.

                   (ii) In the event that severance pay is due to Employee as a
                  result of the "involuntary termination" of HIS employment
                  "without cause", Employee will be paid six months' "base
                  salary" at the rate in effect immediately prior to the
                  termination in six equal monthly installments (subject to all
                  applicable taxes and other deductions), with the first such
                  installment due 15 days after the date of such termination and
                  with the following five installments due no later than monthly
                  thereafter on Company's then regular payroll dates. The
                  Company will also pay the employer contribution and
                  administrative cost of the health insurance premiums for the
                  medical and dental insurance coverage previously maintained by
                  the Company for Employee and HIS eligible dependents during
                  this six month period or until Employee is provided or obtains
                  medical and dental insurance coverage by another employer or
                  entity, whichever first occurs.

          (c)     Change of Control - Separation Benefits.

                  (i) Upon "involuntary termination" of HIS employment due to a
                  "change of control" of Heska Corporation, Employee will be
                  entitled to severance pay as provided in Paragraph 6(c)(iv)
                  below, unless HE is terminated for "cause", as defined in
                  Paragraph 6(d)(ii) below. Employee's entitlement to any
                  severance pay is dependent on HIS execution of a complete
                  release of claims against Company and its affiliates.

                  (ii) For the purposes of this Employment Agreement, "change of
                  control" is defined as the merger, acquisition or sale of
                  Company or all or substantially all of its assets with, into,
                  or to a previously unaffiliated third party entity, other than
                  a merger in which the shareholders of Company prior to the
                  merger, by reason of such shareholdings, own more than 50% of
                  the outstanding shares of the company after the merger.

                                      -2-
<PAGE>   3

                  (iii) The parties agree that for the purposes of this
                  Employment Agreement, an "involuntary termination" due to a
                  "change of control" will be deemed to have occurred when
                  Employee is no longer employed by the Company's successor
                  following a "change of control" because the Employee's
                  position is eliminated within nine (9) months of the "change
                  of control" or when Employee's job responsibilities are
                  materially and negatively changed within nine (9) months of
                  the "change of control", and Employee elects to resign.

                  (iv) In the event that severance pay is due to Employee as a
                  result of the "involuntary termination" of HIS employment
                  without "cause" due to a "change of control", Employee will be
                  paid one (1) year's "base salary" at the rate in effect
                  immediately prior to the termination in twelve equal monthly
                  installments (subject to all applicable taxes and other
                  deductions), with the first such installment due 15 days after
                  the date of such termination and with the following eleven
                  installments due no later than monthly thereafter on Company's
                  then regular payroll dates. The Company will also pay the
                  employer contribution and administrative cost of the health
                  insurance premiums for the medical and dental insurance
                  coverage previously maintained by the Company for Employee and
                  HIS eligible dependents during this one year period or until
                  Employee is provided or obtains medical and dental insurance
                  coverage by another employer or entity, whichever first
                  occurs.

         (d)      Termination "For Cause"; Voluntary Resignation.

                  (i) If Company or its successor terminates Employee for
                  "cause" or if Employee's employment terminates for any reason
                  other than a termination by the Company "without cause" (as
                  set forth in paragraph 6(b)) or due to a "change of control"
                  (as set forth in Paragraph 6(c)), Employee will not be
                  entitled to any severance pay and shall only receive pay and
                  benefits which Employee earned as of the date of termination.

                  (ii) The parties agree that for the purposes of this
                  Employment Agreement, a termination for "cause" will be deemed
                  to have occurred when Company terminates Employee's employment
                  because of the occurrence of any of the following events:

                           (A) Employee shall refuse to accept a change or
                           modification of HIS title, duties or responsibilities
                           by senior management and/or the Board of Directors;

                           (B) Employee shall refuse to accept a reasonable
                           transfer not arising from a change in control to a
                           position with comparable responsibility and salary
                           with any affiliated company that does not involve
                           commuting more than fifty (50) miles each way from
                           the Company headquarters in the Fort Collins,
                           Colorado area;

                                      -3-
<PAGE>   4

                           (C) Employee shall die, be adjudicated to be mentally
                           incompetent or become mentally or physically disabled
                           to such an extent that Employee is unable to perform
                           HIS duties under this Employment Agreement for a
                           period of ninety (90) consecutive days;

                           (D) Employee shall commit any breach of HIS
                           obligations under this Agreement;

                           (E) Employee shall commit any breach of any material
                           fiduciary duty to Company;

                           (F) Employee shall be convicted of, or enter a plea
                           of nolo contendere to, any crime involving moral
                           turpitude or dishonesty, whether a felony or
                           misdemeanor, or any crime which reflects so
                           negatively on Company as to be detrimental to
                           Company's image or interests;

                           (G) Employee shall commit insubordination or refusal
                           to comply with any request of HIS supervisor or the
                           Board of Directors of Company relating to the scope
                           or performance of Employee's duties;

                           (H) Employee shall possess any illegal drug on
                           Company premises or Employee shall be under the
                           influence of illegal drugs or abusing prescription
                           drugs or alcohol while on Company business or on
                           Company premises; or

                           (I) Employee shall conduct HIMSELF in a manner that,
                           in the good faith and reasonable determination of the
                           Senior Management and/or the Board of Directors,
                           demonstrates Employee's unfitness to serve.

7. Proprietary Information. Employee agrees that, if HE has not already done so,
HE will promptly execute Company's standard employee proprietary information and
assignment of inventions agreement.

8. Arbitration; Attorneys' Fees. If any dispute arises under this Agreement or
by reason of any asserted breach of it, or from the Parties' employment
relationship or any other relationship, the Company, at its sole discretion, may
elect to have the dispute resolved through arbitration, so long as all of the
arbitrator's fees and expenses are borne exclusively by the Company. The
arbitration shall be conducted pursuant to the rules of the American Arbitration
association, with the arbitrator being selected by mutual agreement of the
parties. Regardless of whether the dispute is resolved through arbitration or
litigation, the prevailing party shall be entitled to recover all costs and
expenses, including reasonable attorneys' fees, incurred in enforcing or
attempting to enforce any of the terms, covenants or conditions, including costs
incurred prior to commencement of arbitration or legal action, and all costs and
expenses, including reasonable attorneys' fees, incurred in any appeal from an
action brought to enforce any of the terms, covenants or conditions. For
purposes of this section, "prevailing party" includes, without limitation, a
party who agrees to dismiss a suit or proceeding upon the other's payment or
performance of substantially the relief sought.

                                      -4-
<PAGE>   5

9. Notices. Any notice to be given to Company under the terms of this Agreement
shall be addressed to Company at the address of its principal place of business.
Any notice to be given to Employee shall be addressed to HIM at HIS home address
last shown on the records of Company, or to such other address as Employee shall
have given notice of hereunder.

10. Miscellaneous. This Agreement shall be governed by the laws of the State of
Colorado as applied to contracts between residents of that state to be performed
wholly within that state. This Agreement is the entire agreement of the parties
with respect to the subject matter hereof and supersedes all prior
understandings and agreements. This Agreement may be modified only by a written
document signed by both parties, except that the Company, in its discretion, may
modify any policies, guidelines or other directives, none of which shall
constitute a binding agreement or impose any contractual obligations. This
Agreement shall be binding upon and shall inure to the benefit of the successors
and assigns of the parties.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement the day and
year hereinabove written.

                                    HESKA CORPORATION

                                    By:       /s/ Robert B. Grieve
                                        ----------------------------------------

                                    Title:  Chairman and Chief Executive Officer
                                           -------------------------------------

                                    EMPLOYEE

                                    Name:  /s/ Dan. T. Stinchcomb
                                        ----------------------------------------
                                               DAN T. STINCHCOMB

                                      -5-<PAGE>   1

                                                                   EXHIBIT 10.41

                              EMPLOYMENT AGREEMENT

THIS EMPLOYMENT AGREEMENT ("Agreement") is entered into by and between Heska
Corporation, a Delaware corporation with its principal office at 1613 Prospect
Parkway, Fort Collins, Colorado 80525 ("Company") and CAROL VERSER ("Employee"),
effective as of MAY 1, 2000.

                              W I T N E S S E T H:

Whereas Company desires to employ Employee to act as its VICE PRESIDENT,
INTELLECTUAL PROPERTY AND BUSINESS DEVELOPMENT in an at-will capacity; and

Whereas Employee wishes to act as Company's VICE PRESIDENT, INTELLECTUAL
PROPERTY AND BUSINESS DEVELOPMENT as an employee in an at-will capacity;

NOW, THEREFORE, in consideration of the mutual covenants and warranties
contained herein, the parties agree as follows:

1. Employment. Company hereby employs Employee as its VICE PRESIDENT,
INTELLECTUAL PROPERTY AND BUSINESS DEVELOPMENT, and Employee hereby accepts such
employment.

2. Duties and Responsibilities. Employee shall serve as VICE PRESIDENT,
INTELLECTUAL PROPERTY AND BUSINESS DEVELOPMENT of Company, with such duties and
responsibilities as may be assigned to HER from time to time by HER superior
officers (the "Senior Management") and/or the Board of Directors of Company, and
with such on-going daily duties and responsibilities as are typically entailed
in such position. The Senior Management and/or the Board of Directors shall be
entitled to change such title, duties and responsibilities from time to time, in
their discretion. Employee shall devote HER full time and energies to such
duties.

3. Compensation. Company shall pay Employee, as compensation for services
rendered under this Agreement, a "base salary" per year, the amount of which
shall initially be $140,000, which may be increased from time-to-time by the
Company in its discretion. If for any reason during any given year, Employee
does not work an entire year, other than normal vacations as provided hereunder,
the compensation will be prorated to compensate only for the actual time worked.

4. Expenses. Company shall reimburse Employee for HER reasonable out-of-pocket
expenses incurred in connection with the business of Company, including travel
away from the Company's facilities, upon presentation of appropriate written
receipts and reports and subject to the customary practices and limitations of
Company.

5. Employee Benefits. During the term of HER employment hereunder, Employee
shall be entitled to receive the same benefits that the Board of Directors
establishes generally for the officers and other employees of Company. These may
include, from time to time, medical insurance, life insurance, paid vacation
time and medical disability insurance.

                                       -1-
<PAGE>   2

6. Termination.

         (a)      At-Will. This is an at-will employment agreement and does not
         bind either of the parties to any specific term or duration.

                  (i) Employee is free to terminate employment with Company at
                  any time, for any reason, or for no reason, for cause or
                  without cause, and without any prior notice.

                  (ii) Company is free to terminate the employment of Employee
                  at any time, for any reason or for no reason, for cause or
                  without cause, and without any prior notice.

         (b)      Termination "Without Cause" -- Separation Benefits.

                  (i) Upon "involuntary termination" of HER employment with
                  Heska Corporation for other than a "change of control", as
                  defined in Paragraph 6(c)(iii) below, Employee will be
                  entitled to severance pay as provided in Paragraph 6(b)(ii)
                  below, unless SHE is terminated for "cause", as defined in
                  Paragraph 6(d)(ii) below. Employee's entitlement to any
                  severance pay is dependent on HER execution of a complete
                  release of claims against Company and its affiliates.

                  (ii) In the event that severance pay is due to Employee as a
                  result of the "involuntary termination" of HER employment
                  "without cause", Employee will be paid six months' "base
                  salary" at the rate in effect immediately prior to the
                  termination in six equal monthly installments (subject to all
                  applicable taxes and other deductions), with the first such
                  installment due 15 days after the date of such termination and
                  with the following five installments due no later than monthly
                  thereafter on Company's then regular payroll dates. The
                  Company will also pay the employer contribution and
                  administrative cost of the health insurance premiums for the
                  medical and dental insurance coverage previously maintained by
                  the Company for Employee and HER eligible dependents during
                  this six month period or until Employee is provided or obtains
                  medical and dental insurance coverage by another employer or
                  entity, whichever first occurs.

         (c)      Change of Control -- Separation Benefits.

                  (i) Upon "involuntary termination" of HER employment due to a
                  "change of control" of Heska Corporation, Employee will be
                  entitled to severance pay as provided in Paragraph 6(c)(iv)
                  below, unless SHE is terminated for "cause", as defined in
                  Paragraph 6(d)(ii) below. Employee's entitlement to any
                  severance pay is dependent on HER execution of a complete
                  release of claims against Company and its affiliates.

                  (ii) For the purposes of this Employment Agreement, "change of
                  control" is defined as the merger, acquisition or sale of
                  Company or all or substantially all of its assets with, into,
                  or to a previously unaffiliated third party entity, other than
                  a merger in which the shareholders of Company prior to the
                  merger, by reason of such shareholdings, own more than 50% of
                  the outstanding shares of the company after the merger.

                                      -2-
<PAGE>   3

                  (iii) The parties agree that for the purposes of this
                  Employment Agreement, an "involuntary termination" due to a
                  "change of control" will be deemed to have occurred when
                  Employee is no longer employed by the Company's successor
                  following a "change of control" because the Employee's
                  position is eliminated within nine (9) months of the "change
                  of control" or when Employee's job responsibilities are
                  materially and negatively changed within nine (9) months of
                  the "change of control", and Employee elects to resign.

                  (iv) In the event that severance pay is due to Employee as a
                  result of the "involuntary termination" of HER employment
                  without "cause" due to a "change of control", Employee will be
                  paid one (1) year's "base salary" at the rate in effect
                  immediately prior to the termination in twelve equal monthly
                  installments (subject to all applicable taxes and other
                  deductions), with the first such installment due 15 days after
                  the date of such termination and with the following eleven
                  installments due no later than monthly thereafter on Company's
                  then regular payroll dates. The Company will also pay the
                  employer contribution and administrative cost of the health
                  insurance premiums for the medical and dental insurance
                  coverage previously maintained by the Company for Employee and
                  HER eligible dependents during this one year period or until
                  Employee is provided or obtains medical and dental insurance
                  coverage by another employer or entity, whichever first
                  occurs.

         (d)      Termination "For Cause"; Voluntary Resignation.

                  (i) If Company or its successor terminates Employee for
                  "cause" or if Employee's employment terminates for any reason
                  other than a termination by the Company "without cause" (as
                  set forth in paragraph 6(b)) or due to a "change of control"
                  (as set forth in Paragraph 6(c)), Employee will not be
                  entitled to any severance pay and shall only receive pay and
                  benefits which Employee earned as of the date of termination.

                  (ii) The parties agree that for the purposes of this
                  Employment Agreement, a termination for "cause" will be deemed
                  to have occurred when Company terminates Employee's employment
                  because of the occurrence of any of the following events:

                           (A) Employee shall refuse to accept a change or
                           modification of HER title, duties or responsibilities
                           by senior management and/or the Board of Directors;

                           (B) Employee shall refuse to accept a reasonable
                           transfer not arising from a change in control to a
                           position with comparable responsibility and salary
                           with any affiliated company that does not involve
                           commuting more than fifty (50) miles each way from
                           the Company headquarters in the Fort Collins,
                           Colorado area;

                                      -3-
<PAGE>   4

                           (C) Employee shall die, be adjudicated to be mentally
                           incompetent or become mentally or physically disabled
                           to such an extent that Employee is unable to perform
                           HER duties under this Employment Agreement for a
                           period of ninety (90) consecutive days;

                           (D) Employee shall commit any breach of HER
                           obligations under this Agreement;

                           (E) Employee shall commit any breach of any material
                           fiduciary duty to Company;

                           (F) Employee shall be convicted of, or enter a plea
                           of nolo contendere to, any crime involving moral
                           turpitude or dishonesty, whether a felony or
                           misdemeanor, or any crime which reflects so
                           negatively on Company as to be detrimental to
                           Company's image or interests;

                           (G) Employee shall commit insubordination or refusal
                           to comply with any request of HER supervisor or the
                           Board of Directors of Company relating to the scope
                           or performance of Employee's duties;

                           (H) Employee shall possess any illegal drug on
                           Company premises or Employee shall be under the
                           influence of illegal drugs or abusing prescription
                           drugs or alcohol while on Company business or on
                           Company premises; or

                           (I) Employee shall conduct HERSELF in a manner that,
                           in the good faith and reasonable determination of the
                           Senior Management and/or the Board of Directors,
                           demonstrates Employee's unfitness to serve.

7. Proprietary Information. Employee agrees that, if SHE has not already done
so, SHE will promptly execute Company's standard employee proprietary
information and assignment of inventions agreement.

8. Arbitration; Attorneys' Fees. If any dispute arises under this Agreement or
by reason of any asserted breach of it, or from the Parties' employment
relationship or any other relationship, the Company, at its sole discretion, may
elect to have the dispute resolved through arbitration, so long as all of the
arbitrator's fees and expenses are borne exclusively by the Company. The
arbitration shall be conducted pursuant to the rules of the American Arbitration
association, with the arbitrator being selected by mutual agreement of the
parties. Regardless of whether the dispute is resolved through arbitration or
litigation, the prevailing party shall be entitled to recover all costs and
expenses, including reasonable attorneys' fees, incurred in enforcing or
attempting to enforce any of the terms, covenants or conditions, including costs
incurred prior to commencement of arbitration or legal action, and all costs and
expenses, including reasonable attorneys' fees, incurred in any appeal from an
action brought to enforce any of the terms, covenants or conditions. For
purposes of this section, "prevailing party" includes, without limitation, a
party who agrees to dismiss a suit or proceeding upon the other's payment or
performance of substantially the relief sought.

                                      -4-
<PAGE>   5

9. Notices. Any notice to be given to Company under the terms of this Agreement
shall be addressed to Company at the address of its principal place of business.
Any notice to be given to Employee shall be addressed to HER at HER home address
last shown on the records of Company, or to such other address as Employee shall
have given notice of hereunder.

10. Miscellaneous. This Agreement shall be governed by the laws of the State of
Colorado as applied to contracts between residents of that state to be performed
wholly within that state. This Agreement is the entire agreement of the parties
with respect to the subject matter hereof and supersedes all prior
understandings and agreements. This Agreement may be modified only by a written
document signed by both parties, except that the Company, in its discretion, may
modify any policies, guidelines or other directives, none of which shall
constitute a binding agreement or impose any contractual obligations. This
Agreement shall be binding upon and shall inure to the benefit of the successors
and assigns of the parties.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement the day and
year hereinabove written.

                                    HESKA CORPORATION

                                    By:      /s/ Robert B. Grieve
                                        ----------------------------------------

                                    Title: Chairman and Chief Executive Officer
                                           -------------------------------------

                                    EMPLOYEE

                                    Name: /s/ Carol Talkington Verser
                                          --------------------------------------
                                                    CAROL VERSER

                                      -5-

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