Flying with your dog

Bringing your dog to Portugal

Here's the whole picture for taking a dog from the U.S. to Portugal: the vaccines, the certificate, a realistic timeline, and the part most people miss, the paperwork for coming home. Danny and his service dog Copper have made this exact trip; this is the process, written plainly.

Portugal at a glance

Vaccines: Rabies, given after an ISO microchip, at least 21 days before travel.
Certificate: USDA-endorsed EU health certificate; endorsed within 10 days of your EU arrival.
Quarantine: No quarantine when EU entry rules are met.
When to start: Start ~1 month out: microchip first, then rabies, then vet + USDA endorsement.

Facts verified against the official sources on August 20, 2026.

The timeline, working backward from your flight

Work backward from your departure date. The order matters more than the dates: several steps only count if the one before them happened first.

~6 weeks before: Ensure an ISO-compliant microchip is implanted BEFORE the rabies shot
~4 weeks before: Get the rabies vaccination (must be ≥21 days before travel, <1 year)
5 days before: Accredited vet issues the EU health certificate
2 days before: USDA endorses the certificate (within 10 days of your EU arrival)

A member checklist turns this into real calendar dates for your exact trip and airline, with the DOT forms pre-filled where they apply.

The rules, in plain English

Portugal follows the EU pet-entry rules, so order matters. Your dog needs an ISO-compliant microchip implanted before the rabies vaccination — a vet must scan the chip before giving the shot, or the vaccination won't count. The first rabies vaccination after the microchip (or after any lapse) is the "primary" and, for U.S.-vaccinated pets, is valid for 1 year; give it at least 21 days before travel but less than a year before (3–6 months out is comfortable).

You then need an EU health certificate: for pets traveling with their owner (the "non-commercial" route), a USDA-accredited veterinarian issues it, the certificate is valid for 30 days from issue, and APHIS must endorse it within 10 days of your arrival in the EU. Travel with all original rabies certificates, and it's strongly recommended the microchip number is recorded on them. Once in the EU, the non-commercial certificate lets you move between EU countries for up to 4 months as long as the rabies vaccination stays valid. (Copper's own EU trips followed exactly this sequence.)

The two ways dogs fly to Portugal

Dogs fly in the cabin two ways, and the Portugal rules above apply to both. A small dog can fly as a pet in a carrier under the seat: each airline sets its own size rules, charges a pet fee each way, and caps pet spots per flight. A trained service dog flies at any size with no pet fee under the ACAA, using the two official U.S. DOT forms. Not sure which door is yours? Take the 2-minute quiz.

For this destination: EU rules are the same across member states; the airline handles the cabin process.

Coming home: don't skip this part

Coming home is the step people forget to plan. Since August 1, 2024, every dog entering or returning to the U.S. needs the CDC Dog Import Form. The good news: Portugal is not on the CDC's high-risk list for dog rabies, so that free online form is the only CDC document. You can fill it out on travel day and show the receipt on your phone, and it stays valid 6 months for repeat trips from the same country. Your dog must also be microchipped, at least 6 months old, and healthy on arrival.

U.S. re-entry rules verified August 20, 2026. CDC — Entry from dog-rabies free or low-risk countries is the final word.

Copper's been there

Danny holding Copper above the beach at Nazaré, Portugal — Danny and Copper above Nazaré. Copper flew JFK to Lisbon in the cabin.

Portugal is the trip that started all of this. Copper flew JFK to Lisbon at Danny's feet, walked the blue-tiled streets, and came home with an EU Pet Passport (issued in Portugal, good across the EU while his rabies vaccination stays current).

The paperwork sequence on this page is the exact one Copper's vet followed: microchip first, rabies second, certificate and endorsement last. Get the order right and the rest is calendar work.

Pick your airline

Portugal sets the entry rules; the airline sets the cabin process (advance notice, where to submit the DOT forms, pet fees and carrier sizes). We keep a guide for every major U.S. carrier:

Common questions: dogs to Portugal

Does my dog need a health certificate to go to Portugal?

USDA-endorsed EU health certificate; endorsed within 10 days of your EU arrival. A USDA-accredited veterinarian handles the certificate (not every vet is one).

How far in advance should I start preparing my dog for Portugal?

Start ~1 month out: microchip first, then rabies, then vet + USDA endorsement.

Will my dog be quarantined in Portugal?

No quarantine when EU entry rules are met.

Can my small dog fly in the cabin to Portugal?

Usually yes, in a carrier under the seat, subject to the airline's size rules and a pet fee each way, with limited pet spots per flight. Portugal entry rules are the same whether your dog flies as a pet or as a service dog. Not sure which way your dog flies? Take the 2-minute quiz.

Do service dogs need the same Portugal paperwork as pet dogs?

Yes. Portugal's import rules (microchip, vaccines, certificate) apply to every dog. The U.S. DOT forms are separate: they cover the airline side for trained service dogs (no pet fee, any size, cabin at your feet). There is no U.S. registry or certification for service animals, and none is required by law.

What does my dog need to come back into the U.S.?

Want the exact checklist for your trip? Paws on Board turns your route, airline, and dates into a step-by-step plan with real deadlines, fills the DOT forms where they apply, and lets you ask Copper anything about Portugal. Free to join.

Become a member, it's free Already a member? Plan this trip →

Sources

Not legal advice, and not a certification of anything. Import rules change without notice: confirm the current requirements with a USDA-accredited veterinarian and the official sources above before you book. Facts on this page last verified August 20, 2026. All airlines and destinations →