United States → Mexico

Go to the SENASICA office (OISA) at the point of entry with the pet in a clean carrier. Staff check that it shows no signs of infectious disease, is free of external parasites and has no fresh or healing wounds. If external parasites are found, a vet of your choice must treat the pet; ticks are sampled and removed and the pet waits at the OISA for the lab result (see quarantine). Costs are the importer's.

A dirty carrier, or one with disposable bedding (pads, newspaper, sawdust, rags), toys or food, is disinfected and everything inside is removed and destroyed.

The sheet allows the ration of balanced (commercial) pet food for the day of arrival. More food is allowed only in intact, labelled packs (Spanish, English or another understandable language) from a country with an MCRZI combination — for dry or wet dog/cat food one 50 lb / 22 kg bag per family, the USA being a listed country — per SENASICA's food page and 2026 tourist-import list (see the rule notes).

Zoosanitary import certificate (Certificado Zoosanitario para Importación, CZI), issued by SENASICA at the OISA on arrival once the sheet's requirements are met — no advance application. Ask the OISA staff for request form FF-SENASICA-003 (pet dog / pet cat versions; fields for the microchip number, origin and provenance, address in Mexico). Customs (ANAM) must be shown the certificate. No fee for pets (see fees).

Up to three pets per passenger enter duty-free as part of the passenger's baggage, travelling with them (RGCE 2026 rule 3.2.3, in force for 2026). The sources consulted do not say what happens with a fourth pet (not researched).