How to Fly With a Dog: The Complete Guide

By Boops Editorial Voice

✓ Medically reviewed by Boops Editorial Voice — July 13, 2026

Dog Travel · July 22, 2026 · 5 min read

Flying with a dog is mostly logistics: a short list of decisions made in the right order, weeks before you reach the gate.

Flying with a dog is mostly logistics, and most of the work happens weeks before you ever reach the gate. Make the big decisions in the right order and the day itself gets boring, which, when you’re moving an animal through an airport, is exactly what you want. Here’s the sequence we’d follow.

First decision: cabin or cargo?

Everything downstream depends on this one, and your dog’s size and shape decide it for you. Most airlines only allow a dog in the cabin if the dog plus its carrier fit, and stay, under the seat in front of you. In practice that means a dog up to roughly 15 to 20 pounds, depending on build. Larger dogs travel as checked baggage or in air cargo, down in the temperature-controlled hold.

Two things push a dog toward cargo, and both deserve to be taken seriously. The first is simply size. The second is breed. Brachycephalic dogs, the short-nosed, flat-faced breeds like Bulldogs, Pugs, Boston Terriers, and Boxers, are more prone to overheating and breathing trouble under the heat, stress, and thinner cabin air of a flight, and the AVMA flags them as higher-risk fliers. Many airlines now refuse to carry these breeds in cargo at all. If your dog is flat-faced and too big for the cabin, that can mean not flying, and a long drive is sometimes the more honest answer.

Dogs that do fly in cargo travel in a hard-sided kennel meeting the IATA Live Animals Regulations: rigid plastic or fiberglass, a leak-proof floor, ventilation on multiple sides, and hardware that bolts shut rather than snaps. A short list of strong, so-called fighting-type breeds (pit-bull-type dogs, Cane Corso, Dogo Argentino, and a few others) require a reinforced CR82 crate. Confirm the exact standard with the airline before you buy anything.

Lock in the pet reservation early

Airlines cap the number of animals per flight, often just a few in the cabin, so a seat for you is not a spot for your dog. Call the airline directly and add the pet to your booking the moment your dates are set. Ask three things while you have them on the line: the current pet fee, the maximum carrier dimensions for the specific aircraft on your route, and whether any connection on your itinerary crosses a border or switches airlines. Regional jets have smaller under-seat spaces than mainline aircraft, so a carrier that clears a 737 may not fit a small commuter plane on the last leg.

Handle the health paperwork

Build in time for a vet visit, because the paperwork can’t be rushed at the end. For most air travel, airlines want a Certificate of Veterinary Inspection (CVI), a health certificate signed by a licensed veterinarian and usually dated within 10 days of departure. Bring proof of a current rabies vaccination as well.

International trips are a separate project. The destination country sets the rules, the certificate generally has to come from a USDA-accredited veterinarian, and many countries require USDA endorsement through the APHIS VEHCS system before you leave. Start that at least a month out, since some countries add rabies titer tests and waiting periods on top.

One rule catches people on the way home. Since August 1, 2024, every dog entering the United States, including US dogs returning from a trip abroad, must be at least six months old, microchipped, and arrive with a CDC Dog Import Form receipt. Dogs coming from countries where dog rabies is still a risk face extra steps. Domestic interstate travel is far simpler, though a few destinations run their own quarantine and testing regimes (Hawaii most notably), so check the rules of the state you’re flying into.

Pick a carrier your dog can actually stand up in

For the cabin, buy a soft-sided carrier and measure it against your airline’s limit. Around 18 by 11 by 11 inches is the common ceiling, though the real constraint is the under-seat gap on your particular plane. The part people skip is fit: your dog has to be able to stand up, turn around, and lie down inside it. A carrier that’s too small isn’t just uncomfortable, it’s a reason a gate agent can turn you away.

Then acclimate your dog to the carrier well ahead of the trip. Leave it open at home with a blanket and a few treats inside, feed some meals near it, and work up to short car rides. A dog that already reads the carrier as a safe den handles the airport far better than one meeting it for the first time at security.

Why we don’t sedate dogs to fly

Here’s the part where the tempting move is the wrong one. We don’t recommend giving your dog a sedative or tranquilizer for a flight unless your own veterinarian has prescribed one for a specific medical reason. The AVMA’s guidance is the same. Sedation can depress breathing and heart function, and altitude changes make those effects harder to predict, so a dose that looks mild on the ground can hit harder in the air. The risk is sharper still for the flat-faced breeds already prone to airway trouble. Many airlines won’t accept a dog that appears sedated, and some ask you to sign a statement that you haven’t medicated it. If your dog’s travel anxiety runs deep, talk to your vet about behavioral preparation and non-sedating options well before the trip, not the night before.

Getting through the airport and onto the plane

Feed a light meal three to four hours before departure rather than right before it, and keep water available up to boarding. Walk your dog and let it relieve itself before you head into security.

At the TSA checkpoint the carrier goes through the X-ray scanner empty. Never send your dog through the X-ray machine. Take the dog out, carry it or walk it on a leash through the metal detector while the empty carrier is scanned, and expect the officer to swab your hands for explosive trace detection. Put the dog back in its carrier at the recomposure area past the checkpoint, not standing in the middle of it. Book direct flights when you reasonably can, because layovers add heat exposure, tarmac time, and, for a dog in cargo, more chances to be mishandled between planes.

The bottom line

Flying with a dog comes down to a handful of decisions made early and in order: cabin or cargo, the reservation, the paperwork, the right carrier, and a firm no to sedation. Settle those a few weeks out, confirm the specifics with your airline instead of assuming them, and the flight itself becomes the easy part.