Exhibit 99.2 JOINT FILING AGREEMENT In accordance with Rule 13d-1(f)(1) of Regulation 13D of the General Rules and Regulations of the Securities and Exchange Commission under the Securities Act of 1934, as amended, the undersigned agree to the joint...

                                                                   Exhibit 99.2

                            JOINT FILING AGREEMENT

In accordance  with Rule  13d-1(f)(1) of Regulation 13D of the General Rules and
Regulations of the Securities and Exchange  Commission  under the Securities Act
of 1934, as amended, the undersigned agree to the joint filing on behalf of each
of them of this statement and any amendments hereto.

Date:  June 18, 1999

                             VIRBAC S.A.

                             By:    /s/ XXXXXX XXXXXX
                             Name:  Xxxxxx Xxxxxx
                             Title:  President


                             DURVET/PMR, L.P.
                             By:  DURVET, INC.,
                                    its general partner

                             By:   /s/ XXXXXX X. XXXXXXX
                             Name: Xxxxxx X. Xxxxxxx
                             Title:  President

                             /s/ X. X. XXXXX, XX.
                             X.X. Xxxxx, Xx.

                             /s/ XXXXX X. XXXXX
                             Xxxxx X. Xxxxx

                             /s/ XXXXXX X. XXXXXXX
                             Xxxxxx X. Xxxxxxx

                             /s/ XXXX X. XXXXXXXXX, XX
                             Xxxx X. Xxxxxxxxx, XX

                             /s/ XXXXXX X. XXXXXXX
                             Xxxxxx X. Xxxxxxx

                             /s/ XXXXXX X. XXXXXXXXX
                             Xxxxxx X. Xxxxxxxxx