Last updated August 20, 2026 · Independent guide — not affiliated with USDA or SENASICA
Sea-Tac flies nonstop to Cancún, Los Cabos and Puerto Vallarta seasonally. Washington's Cascade corridor has clinics that publish dedicated Mexico travel-certificate services, an unusual head start on the new NWS requirement.
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 Seattle
Clinics in the Seattle area that publicly advertise USDA-accredited certificate services:
Cascade Veterinary ClinicsAdvertises accredited services
Publishes a dedicated Mexico travel certificates page. Confirm by phone that a USDA-accredited vet will sign the NWS Inspection Certificate and that an appointment fits your 5-day window.
Can't find an accredited vet in Seattle?
- 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 Washington 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 →
Are you a Seattle veterinarian issuing NWS certificates? Get listed — free while the directory grows.