What a dog needs to enter Mexico under the new rule

On August 3, 2026, the rules for bringing a dog into Mexico from the United States changed. Cats were left alone, dogs picked up a new certificate, and both sides of the border added a New World screwworm inspection to a workflow that used to run on a rabies stamp and a friendly agent.

The change is federal, and it lands on ordinary trips: a Tulum resident driving north with a dog, a snowbird flying in with a cat for the winter, anyone who booked a Riviera Maya move on paperwork last verified in 2024. Bringing a pet to Mexico is still simple. It just runs on a different form now.

This guide walks through the trip in order: what the vet signs, what SENASICA checks at the airport, which Tulum clinics are open at night, what the airlines charge, and what the return trip requires.

The new screwworm inspection is the piece that changed

The change came from a public animal health concern, not a bureaucratic reshuffle. The New World screwworm, a parasitic fly whose larvae feed on live tissue, prompted USDA APHIS, US Customs and Border Protection, and Mexico's SENASICA to coordinate new inspection rules on both sides of the border, according to the guidance summary published by Sanborn's in August 2026.

According to the APHIS page for pet travel from the United States to Mexico, effective August 3, 2026, every dog crossing must carry a NWS Inspection Certificate for Pet Dogs Moving from the United States to Mexico. The certificate must be signed by a USDA-accredited veterinarian and issued no more than 5 days before the trip. The form is available for download from the APHIS site as pet-dogs-nws-inspection.pdf, and it verifies that the animal has been examined and found free of screwworm, ectoparasites, and open wounds.

The five-day window is the piece to plan around. It is not five days from the flight. It is five days from arrival at the Mexican port of entry, which for a Cancun-bound trip means the certificate cannot be issued the week before departure and still cover a connection.

Cats did not get the same rule. According to the APHIS page and to guidance from Sanborn's dated August 2026, cats travel to the border without a health certificate and remain subject only to a visual inspection by SENASICA on arrival. That inspection looks for external parasites, open wounds, and signs of contagious disease. Pet birds receive their own certificate in addition to the dog form, and no other species is treated as a pet for these purposes.

What happens at the airport when the plane lands

Every pet flown into Mexico is inspected at the port of entry by SENASICA at the Oficina de Inspección de Sanidad Agropecuaria (OISA). In Quintana Roo, the relevant offices are located inside Cancun International Airport and Felipe Carrillo Puerto International Airport in Tulum.

According to Cat Abroad's summary of the 2026 rules and the FAQ published by the Mexican Embassy in Austria, the process at the counter is the same one Mexico has used for years. The passenger requests a Certificado Zoosanitario de Importación, the CZI, from SENASICA staff at the counter. The officer inspects the pet and the carrier, verifies the paperwork against the animal on the table, and issues the certificate. Travelers bringing one or two pets pay no fee for the CZI. Three or more trigger commercial import processing and cargo fees.

Animals under three months of age are exempt from the rabies vaccination check, according to the embassy's FAQ. Every animal over three months old entering from a country other than the United States or Canada must arrive with rabies vaccination records and a health certificate issued no more than fifteen days before arrival, or Mexico will treat and observe the animal at the owner's cost. The exemption from the health certificate for dogs and cats from the United States and Canada does not waive the screwworm certificate for dogs, which is a separate document.

Two practical notes at OISA. Carriers with dirty bedding, toys, or old food are disinfected on-site. Carrier hardware needs to be intact, and a cracked door or a stripped screw buys the traveler a delay before the animal clears.

Veterinarians in Tulum, and the short list of 24-hour options

A pet in Tulum eventually needs a vet, and the list is longer than newcomers assume. Directories listing veterinary clinics in the municipality name several that consistently receive ratings from local pet owners.

• Servicios Veterinarios y Urgencias "The Jungle", on 4 Oriente between Osiris and Alfa Norte in Tulum Centro. Offers general care for dogs and cats, sterilization and emergency treatment.
• Clínica Veterinaria Tulum, en la Calle Mercurio Poniente, en Tulum Centro. Emergency care, surgery and exotic animal work, Monday through Saturday.
• Pet Health Services, on Calle Polar Poniente in Tulum Centro. General care for dogs, cats and small species, with extended hours.
• The Pet Experience, in the Gaia Building in Aldea Zama. General veterinary care and grooming, with the clinic's own listing stating 24-hour service for dogs and cats.
• Consultorio Veterinario Yuum Balam, en Chanchén 10. Also lists 24-hour attention for dogs and cats, with surgery, vaccinations, and emergencies.

The 24-hour part matters. A stray dog hit on the highway at 2 in the morning has a short list of doors that answer the phone, so owners planning to stay keep two clinic numbers saved before they need them. Bilingual reception is not standard. A resident who can call in Spanish moves a request faster than an owner who cannot.

Consultation and vaccine prices vary by clinic and are worth confirming by phone. Specialty diagnostics beyond X-ray and complex surgeries usually route to Playa del Carmen or Cancun, sixty-five kilometers up the highway and roughly twice that respectively, according to Heraldo de México Quintana Roo in July 2024.

Aeromexico and Volaris charge by the segment

The paperwork gets the animal to the airport. The fare gets the animal on the plane, and it's not small.

Aeromexico's cabin fee for a pet on a domestic Mexican flight is 1,520 pesos in low season and 1,910 pesos in high season, per segment, according to the airline's policy summary published on ExploreWithLora in 2026. International segments run at 182 dollars in low season and 189 dollars in high season, per segment. The maximum combined weight for the pet and carrier in the cabin is 9 kilograms, roughly 20 pounds. Only dogs and cats are allowed in the cabin. Snub-nosed breeds are subject to varying acceptance rules that must be verified with the airline before booking.

Volaris runs on similar rules and different numbers. Its domestic cabin fee is around 1,200 pesos per segment, and international runs 160 to 190 dollars per segment. The airline allows a combined pet and carrier weight of 12 kilograms (roughly 26 pounds) in the cabin and caps a route at 10 dogs and 6 cats per flight. For a heavier dog, that 12-kilogram allowance is the difference between cabin and cargo.

Both airlines charge per flight segment, so a connecting flight doubles the pet fee, and any animal exceeding cabin weight travels in cargo in a rigid, IATA-compliant crate on a separate booking. Cargo capacity is scarce during holidays and has to be reserved before the passenger ticket.

Return paperwork for a pet leaving Mexico

The rules for taking a dog or cat back to the United States are split between two federal agencies, and both apply.

The CDC handles rabies. According to the CDC page on dog imports from low-risk countries, Mexico is not on the CDC list of high-risk rabies countries in 2026, and the entry document is the CDC Dog Import Form, which must be completed online before travel. For dogs that have only been in low-risk countries in the six months before US entry, the form receipt is the only CDC document needed. The receipt is valid for six months and covers multiple entries from the same low-risk country during that window. A rabies titer test, a quarantine, and a mandatory microchip do not apply on the CDC side for low-risk countries. Some airlines and some US states require an ISO-compatible microchip and a rabies certificate anyway, and Aeromexico documents a minimum age of 6 months for US-bound flights.

USDA APHIS handles screwworm on the return leg, and this is the piece most travelers miss. Guidance summarized by the American Veterinary Medical Association in 2026 states that dogs and cats returning from Mexico must carry a certificate from an official Mexican government veterinarian, dated within five days of travel, confirming inspection with a finding of freedom from New World screwworm or documenting the quarantine and treatment completed in Mexico. The five-day rule that started this article ends it. The screwworm certificate now runs both directions.

The Mexican side of the return certificate must come from a veterinarian authorized to sign for SENASICA, not from any clinic listed in search results. Owners planning a return trip start by asking the local veterinarian whether the clinic is authorized to issue export certificates for animals leaving Mexico, and if not, which Tulum area clinic is.

A checklist that fits on one screen

The steps below fit on one screen if prepared in order.

• Before flying to Mexico with a dog, book a USDA-accredited veterinarian and get the NWS Inspection Certificate signed within five days of arrival.
• Bring the animal in a clean, intact carrier. Skip the extra bedding and the toys.
• Cats and pets under three months of age are exempt from the rabies vaccination check.
• On arrival, ask for the CZI form at SENASICA, get the inspection done, and receive the certificate. No fee for one or two pets.
• In Tulum, log two veterinarian numbers in the phone before the animal needs them, and confirm which one holds an export authorization for the return trip.
• Airlines charge per segment. Book direct where possible, and reserve cargo separately when the pet exceeds cabin weight.
• Before returning to the United States, complete the CDC Dog Import Form online and obtain the SENASICA export inspection certificate within five days of the return flight.

After the paperwork, Tulum handles the rest

A pet clears customs faster than a family. The rules above run about an hour of the trip. What takes longer is the adjustment, and the town has grown up around it. There are boutique hotels that treat a dog like a guest, jungle trails that welcome one, and a rescue community that has spent years building the vet networks a newcomer inherits.

The screwworm certificate is the change, and it is the paragraph everyone needs to read this year. The rest of the arrival is what it has been for a long time. An inspection at a counter, a carrier that has to be intact, and a phone with a veterinarian's number saved before the first emergency.

Our earlier coverage rounds out the picture: a guide to pet-friendly Tulum with restaurants, beaches, and activities; a roundup of pet-friendly hotels in Tulum; the story of the Tejido Sanctuary, which anchors much of the town's rescue network; and a 2026 look at safety in Tulum for arriving residents.

Did the new August paperwork catch you at the border, and where in Tulum did you find a veterinarian you trusted? Join the conversation and share your perspective with us on Instagram and Facebook at @thetulumtimes.