Crossing with your dog can be smooth or a headache — the difference is almost always paperwork you prepped at home, not something you fix at the window.
The CDC classifies Mexico as high-risk for dog rabies, which means extra requirements apply to dogs that haven't been vaccinated in the US, even for a quick day trip.
What CDC actually asks for in 2026
Every dog entering the US — by air, land, or sea — needs three things: to look healthy, to be at least 6 months old, and to carry an ISO-compatible microchip you can scan.
On top of that, you must complete the CDC Dog Import Form online before you arrive. It's free, takes a few minutes, and generates a confirmation you'll want saved on your phone and printed.
| Your dog's rabies vaccine | What you'll need |
|---|---|
| Vaccinated in the US | US-issued rabies certificate + CDC form + microchip |
| Vaccinated in Mexico | Valid rabies certificate, CDC form, and in some cases a US-licensed vet exam after entry |
| Puppy under 6 months | Generally not eligible to cross as a pet — check current CDC guidance before you plan the trip |
Rules get updated, so confirm the exact fine print on the official CDC pet travel page a few days before you drive — don't rely on what worked last year.
The folder you actually need in the car
- Valid rabies vaccination certificate (physical copy, not just a photo on your vet's app)
- Microchip number written down, plus the chip itself working — ask your vet to scan it before you leave
- CDC Dog Import Form confirmation
- Recent photo of your dog, in case an officer needs to confirm identity
- Your own ID and your vehicle's RC USA policy — both get checked more than people expect
Keep a printed folder, not just PDFs on your phone. Border wifi is unreliable, and a dead battery shouldn't be the reason you get sent to secondary inspection.
Not every port works the same way
Land crossings don't always have the same animal-import setup as airports. Busy ports like San Diego or Laredo see pets daily, but staff availability for extra checks can vary by time of day.
🐾 San Diego
High traffic, officers generally familiar with pet paperwork — mornings tend to move faster.
🐾 Laredo
Commercial-heavy port; keep your pet folder on top so it's quick to hand over.
🐾 El Paso
Good option if you're also sorting vehicle permits the same trip — plan extra time for both.
Cats, and other pets
Cats don't face the same CDC rabies scrutiny as dogs right now, but some states still ask for a basic health certificate. If you're traveling with other animals, check state-specific rules — they vary more than people assume.
Airline pet rules and land-border CDC rules aren't the same thing. Don't copy requirements from a flight itinerary onto a driving trip — the paperwork differs.
Your car needs coverage too
Mexican auto insurance doesn't cross the border with you — it stops working the moment you're on US soil, the same way US policies don't cover you back in Mexico. Liability insurance is required by law in every US state you'll drive through.
Timi issues RC USA policies online, by chat, in minutes, backed by Chubb — worth having that ready the same day you sort your dog's paperwork, so neither one holds up the other at the garita. For the general crossing basics, this guide list covers the rest.
Pets add one more layer to border day, but it's a predictable one: the CDC form, the vaccine certificate, a working microchip, and your own documents ready to hand over. None of it is complicated once you've done it once — just don't leave it for the morning you're driving.