Dogs travel on airplanes in one of three ways: inside the passenger cabin in a carrier under your seat, in the cargo hold as checked baggage on your same flight, or in the cargo hold as manifest cargo on a separately booked itinerary. Which option your dog qualifies for depends mostly on size, with the dividing line typically around 20 pounds including the carrier.
In-Cabin Travel for Small Dogs
If your dog is small enough, they can ride in the passenger cabin with you inside an approved carrier that fits under the seat in front of you. Most airlines cap the combined weight of dog and carrier at 20 pounds, and they’ll weigh both at check-in. Your dog needs to be able to stand up and turn around inside the carrier, and the carrier must stay zipped shut and stowed under the seat for the entire flight.
Soft-sided carriers are the standard recommendation because they compress slightly to fit the under-seat space. On American Airlines, for example, soft-sided carriers can measure up to 18 x 11 x 11 inches. Hard-sided kennels have stricter limits and vary by aircraft type, so it’s worth confirming dimensions with the airline before you buy one. The carrier counts as your carry-on bag, so plan your personal items accordingly. Most airlines also limit the number of pets allowed in the cabin per flight, so booking early matters.
Cargo Hold Travel for Larger Dogs
Dogs too large for the cabin travel in the cargo hold, which is pressurized and climate-controlled, essentially the same air and temperature as the passenger cabin above. There are two versions of cargo travel, and the difference matters more than you might expect.
Checked baggage means your dog is booked on the same ticket as you. You drop them off at the airport, they go into the cargo hold of your plane, and you pick them up at your destination. The downside is that your dog’s journey is tied to yours. If your flight gets delayed, rerouted, or involves multiple layovers, your dog sits through all of it.
Manifest cargo means your dog flies on a separately arranged itinerary, often coordinated through a pet transport service. This allows for the most direct routing with fewer layovers, which reduces time in transit and overall stress. It’s also the only option accepted by countries with strict import rules, such as Australia and New Zealand, which don’t allow dogs to arrive as checked baggage at all. If you’re moving multiple pets, manifest cargo lets the airline keep them together.
Carrier and Crate Requirements
For cargo travel, your dog needs a hard-sided, airline-approved crate. It must be large enough for your dog to stand at full height, turn around, and lie down comfortably. The crate needs secure latches, ventilation on at least two sides, a leak-proof bottom, and “Live Animal” labels. You’ll attach food and water dishes that can be filled from outside without opening the door.
Getting your dog comfortable in the crate before travel day makes a real difference. A dog that already sleeps in or relaxes in its crate will handle the experience far better than one encountering it for the first time at the airport.
Temperature Restrictions
Airlines won’t transport dogs in cargo when ground temperatures at departure, layover, or arrival airports are above 85°F or below 45°F. These restrictions exist because dogs are exposed to outdoor temperatures during loading and unloading, even though the cargo hold itself is climate-controlled in flight.
Short-nosed breeds face even tighter limits. Some airlines lower the heat cutoff to 70°F or 75°F for breeds like Bulldogs, Pugs, and Boston Terriers, because their compressed airways make it harder to cool themselves through panting. Many airlines have stopped accepting short-nosed breeds in cargo entirely due to historically higher rates of breathing emergencies. If you have a brachycephalic breed that’s too large for the cabin, your options may be limited to ground transport or pet-specific air charter services.
Health Certificates and Vaccinations
Most airlines require a Certificate of Veterinary Inspection, commonly called a health certificate, issued within 10 days of your travel date. A licensed, accredited veterinarian examines your dog and confirms they’re free of infectious disease and up to date on vaccinations, including rabies. Federal regulations also require dogs to be at least 8 weeks old and weaned for at least 5 days before flying.
For domestic travel between U.S. states, many states require this certificate as well, so even if your airline doesn’t explicitly ask for one, the destination state might. Keep the paperwork accessible, not packed in checked luggage.
International Travel Adds More Steps
Flying your dog to another country means navigating that country’s specific import rules, which can involve months of preparation. For the European Union, your dog must be microchipped, vaccinated against rabies (with the microchip implanted before the vaccination date), and carry a valid EU animal health certificate.
If you’re traveling to the EU from a non-EU country, your dog may also need a rabies antibody blood test. The timing on this is strict: you must wait at least 30 days after the rabies vaccination before the blood draw, and then wait 3 more months from the blood sample date before travel. That’s a minimum of 4 months of lead time. If your dog’s test comes back successful and you keep their rabies boosters current, you won’t need to repeat the blood test for future trips.
Countries like Australia, New Zealand, Japan, and Singapore have their own layered requirements that can include quarantine periods on arrival. Start researching your destination country’s rules at least 6 months ahead.
Service Dogs vs. Emotional Support Animals
Under current Department of Transportation rules, only trained service dogs have guaranteed access to the aircraft cabin regardless of size. A service animal is defined as a dog individually trained to perform specific tasks for a person with a disability, whether physical, sensory, psychiatric, or intellectual. Emotional support animals, comfort animals, and service animals in training are not classified as service animals for air travel and don’t receive the same cabin access. If your dog is an emotional support animal, they’ll need to meet the same size and carrier rules as any other pet, or travel in cargo.
Why Sedation Is Not Recommended
It seems logical that calming your dog with medication would make the flight easier, but veterinary organizations advise against sedating dogs for air travel. Sedation affects a dog’s ability to regulate body temperature and balance, which becomes riskier at altitude and in an environment where no one is monitoring them. A sedated dog in the cargo hold can’t brace against turbulence or adjust their position if the crate shifts. If your veterinarian does prescribe something, the drug name, dosage, and time of administration must be clearly labeled on the outside of the crate.
A better approach for anxious dogs is crate training well in advance, a long walk or play session before heading to the airport, and a familiar-smelling blanket or shirt inside the carrier. Some veterinarians may suggest mild anti-anxiety options that don’t cause full sedation, but that conversation should happen weeks before your trip, not the night before.
Booking and Fees
In-cabin pet fees on major U.S. airlines typically range from $95 to $150 each way. Cargo fees are significantly higher, often $200 to $500 or more depending on the dog’s size and the route. Manifest cargo arranged through a pet transport company can run into the thousands for international routes, though that usually includes handling all the paperwork and logistics.
Airlines limit the number of pets on each flight, both in-cabin and in cargo. Book your dog’s spot as early as possible, especially during peak travel seasons. You’ll typically need to call the airline directly rather than adding a pet through the website’s booking flow. Confirm the pet reservation again 24 to 48 hours before departure, and arrive at the airport early since check-in with a pet takes longer than a standard boarding process.