Airline Pet Policies: What to Check Before You Book

By Jessica Ennis, DVM, CVA

Travel · August 9, 2026 · 5 min read

Before you book, check three things — cabin weight limits, brachycephalic restrictions, and how old your health certificate is allowed to be.

I once had a client call me from an airport curb, thirty minutes before check-in, asking whether her ten-year-old Frenchie could still fly cargo because the counter agent had just told her no. She hadn’t read past the fare page when she booked. That phone call is the reason I tell every owner the same thing now: read the pet policy before you pick the flight, not after.

Start with the cabin-versus-cargo split, because it decides everything else

Most domestic carriers only take small dogs in the cabin, and the definition of “small” is stricter than owners expect. On American Airlines, for example, the combined weight of pet plus carrier can’t exceed 20 lbs, and the carrier itself has to fit under the seat — soft-sided carriers capped around 18” x 11” x 11”, hard-sided slightly smaller, as detailed in CitizenShipper: American Airlines Pet Policy 2026: Dogs, Cats, Cargo & Fees. If your dog doesn’t fit that envelope, you’re either looking at cargo — which comes with its own restrictions — or you’re not flying that dog on that airline at all.

This is where I tell clients to stop shopping by price and start shopping by category. A $200 fare that turns into a cargo booking for a dog who shouldn’t fly cargo isn’t actually the cheaper option.

Brachycephalic breeds deserve their own conversation, not a footnote

If you own a Bulldog, Pug, Boston Terrier, Shih Tzu, or any other short-nosed breed, the policy page you need to read isn’t the general pet page — it’s the breed restriction list, and it’s usually buried lower on the site. Short-nosed dogs don’t move air through their airways as efficiently as longer-snouted dogs, and that becomes a real liability under cargo-hold heat and stress. The American Veterinary Medical Association has reported that brachycephalic breeds account for roughly half of dog deaths during air transport as cargo, based on U.S. Department of Transportation incident data. Most major carriers have responded with partial or full cargo bans on these breeds, and the AVMA also explicitly advises against sedating brachycephalic dogs for travel, since sedation further depresses already-limited respiratory function.

In my practice, this is the single conversation I have most often with owners of senior brachycephalic dogs planning a family trip. I ask what the dog looks like after a short walk on a warm day — open-mouth panting that doesn’t settle in a few minutes, or a dog who recovers fast. A Pug I saw last spring, nine years old, about 22 lbs, still played fetch in the yard without much fuss, but stairs left him panting for a solid five minutes. That’s a dog I’d steer toward driving or a pet relocation service built for brachycephalic breeds, not a cargo hold, regardless of what the airline’s calendar-based temperature restriction technically allows that week.

Health certificate timing trips up more owners than carrier size does

Almost every airline and every destination requires a veterinary health certificate, but the acceptable window varies and it is shorter than people assume. Many airlines require the certificate to be dated within 10 days of travel, and only a USDA-accredited veterinarian can complete the version needed for interstate or international travel, a distinction covered by Navigating Pet Travel? Let APHIS Help. from USDA APHIS. If your destination requires international entry paperwork, that certificate also needs USDA endorsement, which can take several business days depending on the regional office — so this isn’t a same-week errand if you’re leaving the country.

Book the vet appointment as soon as you book the flight. That’s the whole rule, and it solves the majority of last-minute travel scrambles I hear about.

What actually determines airline pet death and injury risk

The pattern in the data isn’t random. Heat exposure on the tarmac, brachycephalic anatomy, and long connection times in cargo are the recurring factors behind reported incidents — not simply “flying with a dog” as a blanket risk. That’s why the same trip can be low-risk for one dog and genuinely dangerous for another. A healthy medium-breed adult dog in a well-ventilated cargo crate on a direct flight in mild weather is a different risk profile than a ten-year-old Bulldog connecting through a hot regional airport in July.

Questions to actually ask before you book, not after

• Does my dog’s combined weight with the carrier fall under the airline’s in-cabin limit?
• Is my breed on the airline’s cargo restriction or seasonal embargo list?
• How many days before departure does my vet need to issue the health certificate, and is my vet USDA-accredited if I need international endorsement?
• Is this a direct flight, and if not, how long is the layover for a cargo-traveling dog?
• What’s the actual airport temperature forecast for departure and arrival that day?

If your dog needs a properly sized, sturdy carrier for the cabin, our guide to Best Airline-Approved Dog Carriers breaks down what “approved” really means beyond the sticker. And if the flight is just one leg of a longer trip, our Complete Guide to How to Fly With a Dog walks through the rest of the process end to end. For dogs making their very first flight, How to Travel With a Puppy for the First Time is worth reading before you book, not after.

Where I land

Read the policy before the price. In my practice, I tell owners to treat the airline’s pet page as part of the medical history review, not fine print — check cabin weight limits, breed restrictions, and health certificate timing in that order, and build the trip around what your dog can actually tolerate rather than what the fare calendar makes convenient.

Bottom line: the safest airline pet policy is the one that matches your specific dog’s size, breed, and health status — not the cheapest fare on the route.