Traveling with a pet involves two separate sets of rules that don’t always align: what the airline requires to let the animal on the plane, and what the destination country requires to let it across the border. Missing either one can mean a pet gets denied boarding or held at customs.
Airline rules: check the specific carrier, every time
Airlines set their own pet policies covering carrier size, in-cabin weight limits, breed restrictions, and how many pets are allowed per flight. These policies differ significantly between carriers and change periodically, so check the specific airline’s current pet policy page before booking rather than relying on what a friend experienced last year or on a different airline. Some airlines cap the number of in-cabin pets per flight, which means booking early matters if you’re traveling with an animal — arriving at the counter with a confirmed seat but no pet reservation can mean the pet doesn’t fly.
Brachycephalic (flat-faced) breeds like bulldogs and pugs face additional restrictions on many airlines, and some carriers won’t accept them as cargo at all due to breathing-related health risks at altitude, though in-cabin travel in the passenger area is usually still allowed since it isn’t pressurized or temperature-controlled the same way cargo holds are.
Health certificates and timing
Most destinations require a health certificate issued by an accredited veterinarian within a specific window before travel — often 10 days for international entry, though this varies by country. Getting this timing wrong is one of the most common reasons pets get stopped at a border, because a certificate issued too early is treated as expired even if the pet is perfectly healthy. Book the vet appointment around your confirmed travel dates, not the other way around.
Border and quarantine requirements
Check the destination government’s official agriculture or customs site directly — in the US, APHIS (part of the USDA) publishes country-specific pet travel requirements, and most other countries have an equivalent agency. Some destinations, notably places with strict rabies control like the UK, Australia, and Japan, have quarantine or extended waiting-period requirements that can take months to satisfy through titer testing and waiting periods, so this needs to be planned far earlier than the rest of the trip.
- Microchipping is required by nearly every destination and often must be done before the rabies vaccination counts as valid for travel purposes — check the required sequence, not just the required items.
- Some countries require an import permit applied for in advance, separate from the health certificate.
- Research pet-friendly lodging before booking — our guide to booking accommodation for every trip type covers how to filter and verify pet policies rather than assuming a listing marked “pet friendly” has no restrictions on size or number.
Making the actual travel day easier
Get your pet comfortable with the carrier weeks before travel, not the morning of. Feed lightly before a flight rather than a full meal, and avoid sedation unless specifically advised by a vet familiar with air travel — sedatives can interact badly with altitude and cabin pressure changes in ways that aren’t always obvious. If your pet needs vaccinations as part of the travel requirements, this is also a good moment to have a broader conversation with your vet, similar to how our piece on travel vaccinations and health prep recommends timing your own shots well ahead of departure rather than the week before.
The paperwork folder
Keep physical copies of every certificate, vaccination record, and permit in one folder, plus photos of each document on your phone as backup. Border agents and airline counter staff have both, at different points, asked for documents that only existed as an email attachment nobody could find at the moment it mattered.
Costs people underestimate
Pet travel costs more than the ticket line item suggests. In-cabin pet fees, cargo fees for larger animals, health certificate costs from the vet, and any required import permits add up before you’ve accounted for pet-friendly lodging, which sometimes carries its own additional deposit or nightly fee on top of the room rate. Budget for these as a distinct line item rather than folding them into general trip costs, since it’s easy to underestimate how much a pet adds to an otherwise ordinary trip once every fee is totaled.
Considering whether the pet should come at all
Not every pet travels well, and it’s worth an honest assessment before committing to bringing one along. An older pet, one with anxiety around unfamiliar environments, or a breed with known respiratory sensitivity may genuinely be better off with a trusted sitter or boarding facility than on a long flight or an unfamiliar multi-stop itinerary. This isn’t a failure of planning — it’s recognizing that some trips are harder on an animal than the alternative of staying home, and a good pet sitter is often kinder than dragging a stressed animal through security and customs.