The requirements for the export of dogs and cats to Mexico are available on the Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria (SENASICA) website.
As specified on SENASICA's website, you must present the border authorities with an original and a copy of a veterinary health certificate that has been issued within the last 10 days.
You have two options for this document:
Have your veterinarian issue the certificate. It must be printed with the clinic letterhead, and contain the licence number of the certifying veterinarian as proof of that veterinarian's right to exercise his/her profession. No official endorsement (signature by a CFIA veterinarian) is required, if this option is chosen.
OR
The General Health Certificate for Cats and Dogs meets Mexico's import conditions. Please note that Mexico may change these requirements without notification to the CFIA. As a result, it is strongly advised to review this certificate to ensure that all requirements are addressed.