Our sources
How we check: every rule in your plan comes from the government agency, airline or rail operator that sets it. We re-check these pages regularly and show the date we last did so. Where an official page isn't available, we use a reliable secondary source and mark the rule "Confirm" in your plan.
United States
- USDA APHIS: pet travel from the US to PortugalHealth certificate, endorsement window and entry requirements for Portugal.
- USDA APHIS: pet travel from the US to SpainRequirements for dogs and cats going to Spain.
- USDA APHIS: pet travel from the US to ItalyRequirements for dogs and cats going to Italy.
- USDA APHIS: bringing cats into the USEntry rules for cats arriving in the United States.
- USDA APHIS: travel between statesInterstate pet travel within the US.
- CDC: dogs from rabies-free and low-risk countriesThe CDC Dog Import Form and age rules for dogs entering the US.
- Hawaii Department of AgricultureHawaii's separate quarantine and entry rules.
United Kingdom
- GOV.UK: taking your pet abroadRules for pets leaving Great Britain.
- GOV.UK: bringing your pet to Great BritainEntry rules, approved routes and tapeworm treatment for dogs.
- GOV.UK: new EU rules for GB residentsChanges to the EU animal health certificate from 1 October 2026.
- DAERA: Great Britain to Northern IrelandThe pet travel document for trips to Northern Ireland.
European Union and international
- Your Europe: travelling with pets in the EUThe EU pet passport and rules for travel between EU countries.
- IATA: pet container requirementsThe crate rules airlines apply, and the formula our crate calculator uses.
Airlines
Weight limits include the crate or carrier. Lufthansa, ITA, Vueling, United, American, Southwest and Alaska Airlines rules come from secondary sources, so your plan marks them "Confirm".
- TAP Air PortugalCabin and hold limits on US routes and within Europe.
- IberiaCabin and hold limits, and breed restrictions.
- Air EuropaCabin and hold limits, and crate requirements.
- DeltaCabin pets and Delta Cargo.
Trains
UK National Rail rules come from a secondary source and are marked "Confirm" in your plan.
- AmtrakCarry-on pets on US trains.
- CP (Comboios de Portugal)Pets on Portuguese trains.
- TrenitaliaPets on Italian trains.
- Renfe News reportDogs up to 40 kg on Spanish trains since 21 July 2026, as reported by El Independiente.
The final say
Pawperwork organises your move and checks your details for errors. It gives general information, not veterinary or legal advice. Official veterinarians, the authorities above and your airline make the final decisions, so always confirm with them before you travel. Spotted a rule that has changed? Tell us and we'll check it.