If you are planning to take your pet across the US-Mexico border for veterinary care, vacation, or relocation, understanding pet border crossing documents is essential. The requirements are straightforward once you know what is needed, but showing up at the border without the right paperwork can result in delays, denial of entry, or quarantine of your pet. This guide covers everything San Diego pet owners need to know about crossing into Mexico with their dog or cat and returning to the United States.
Mexico’s requirements for pets entering the country are relatively simple. You will need a current rabies vaccination certificate showing your pet was vaccinated at least 15 days before entry (but not more than 12 months for annual vaccines or 36 months for 3-year vaccines). The certificate must include the veterinarian’s name and license number, your pet’s description (breed, color, sex, age), the vaccine manufacturer and serial number, and the date of vaccination.
You also need a health certificate issued by a licensed veterinarian within 10 days of travel. This document certifies that your pet was examined and found free of infectious diseases, parasites, and other health conditions that could pose a public health risk. In practice, most veterinarians can issue this certificate during a regular wellness exam.
Mexico does not require a USDA endorsement for pets entering the country, which simplifies the process significantly compared to many other international destinations. However, the paperwork must be in order and available for inspection at the border.
Returning to the United States with your pet involves CDC requirements that are more specific than Mexico’s entry rules. As of the current regulations, all dogs entering the United States must appear healthy upon arrival, be at least 6 months old, be microchipped with an ISO-compatible 15-digit microchip, have a completed CDC Dog Import Form (submitted online prior to arrival), and have proof of valid rabies vaccination.
The CDC updated its dog import requirements in 2024, and the new rules apply regardless of where your dog has been. The key addition is the CDC Dog Import Form, which must be submitted online through the CDC’s system before you arrive at the US port of entry. This form requires your dog’s microchip number, vaccination records, and your contact information.
Here is a complete checklist of pet border crossing documents you should have assembled before your trip:
For entering Mexico: current rabies vaccination certificate, health certificate from a licensed vet (issued within 10 days of travel), and your own valid passport or passport card for the border crossing.
For returning to the US: all of the above, plus a completed CDC Dog Import Form (submitted online before arrival), proof of ISO microchip (the microchip number on all documents must match), and if your dog was vaccinated in Mexico, the vaccination must be administered by a licensed veterinarian and documented in English or with a certified translation.
Cats have simpler requirements than dogs. The CDC does not currently require an import form for cats, and Mexico’s entry requirements mirror those for dogs — a rabies certificate and health certificate. However, requirements can change, so verify current regulations before travel.
Puppies under 6 months old face additional restrictions for US re-entry. The CDC may require additional documentation or deny entry for very young puppies, particularly if they do not yet have a complete rabies vaccination history. If you are traveling with a young puppy, consult with your veterinarian and check the CDC’s current guidelines.
Service animals and emotional support animals are subject to the same health and documentation requirements as all other pets. There are no documentation exemptions based on your pet’s service status for international border crossings.
One of the biggest advantages of using CBX Pet Care for cross-border veterinary visits is that we handle the documentation logistics for you. Before your appointment, our team reviews your pet’s vaccination records, confirms all required documents are in order, and identifies any gaps that need to be addressed before travel. We guide you through the CDC Dog Import Form submission process and ensure your microchip documentation matches across all records.
At the border, our bilingual team assists with any inspection requirements and ensures smooth passage in both directions. We have made this trip hundreds of times and know exactly what border agents look for. You can review our complete process on the how it works page and our detailed border crossing requirements page.
Based on our extensive experience transporting pets across the border, here are practical tips for a smooth crossing. Keep all documents in a single folder or envelope that is easily accessible — do not pack them in luggage. Make copies of everything and store them separately in case originals are lost. Ensure your pet’s microchip is scannable before travel — microchips can migrate under the skin or fail, and discovering this at the border creates problems. Bring your pet’s regular food and any medications they take — border inspectors may ask about medications, and having labeled prescription bottles simplifies the process.
Travel with your pet in a secure carrier or with a properly fitted harness and leash. A loose pet at the border creates chaos and delays. If your pet is anxious, talk to your veterinarian about mild anti-anxiety options for travel — a calm pet makes everything easier.
The documentation requirements for crossing the border with your pet are manageable — especially when you have an experienced team handling the details. San Diego pet owners who cross the border for dental care, diagnostic imaging, or surgical procedures save thousands of dollars, and the paperwork takes less than 30 minutes to prepare.
Get a free estimate from CBX Pet Care — call (619) 914-2990 or visit cbxpetcare.com/contact.
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