Last updated August 20, 2026 · Independent guide — not affiliated with USDA or SENASICA
Denver International runs year-round nonstops to Mexico City, Cancún, Los Cabos and Puerto Vallarta. Colorado travelers should build an extra day into the 5-day window in winter — a weather-delayed flight can push your arrival outside the certificate's validity.
The requirement: since August 3, 2026, dogs entering Mexico from the US must carry an NWS Inspection Certificate signed by a USDA-accredited veterinarian within 5 days of arrival in Mexico. No APHIS endorsement is needed — the signed form is presented at the Mexican border or airport. Full guide here.
Vets offering screwworm certificates in Denver
We're verifying Denver clinics now.
This requirement is weeks old and clinic participation is changing daily. Used a Denver vet for your NWS certificate? Tell us and we'll list them for the next traveler.
Can't find an accredited vet in Denver?
- Call clinics that advertise international health certificates — they're the most likely to have a USDA-accredited vet on staff.
- Ask the exact question: “Can a USDA-accredited veterinarian at your clinic complete the NWS Inspection Certificate for Pet Dogs going to Mexico?”
- Contact the Colorado USDA APHIS Veterinary Services office for a referral, per the official APHIS guidance.
- Download the form ahead of your appointment from the APHIS Mexico pet travel page — many clinics haven't seen it yet.
How to find a USDA-accredited vet →
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