Guide

Flying with a pet in cabin: what airlines and US rules require

Flying with a pet in cabin is possible on many US airlines, but it is a privilege the airline sells, not a right. No federal rule requires an airline to accept a pet dog or cat in the cabin, so the airline's own policy decides the size of the carrier, how many animals fit on a flight and what it costs. Federal rules do decide three other things: how a trained service dog must be treated, how your pet goes through TSA screening, and what a dog needs to enter or return to the United States. This guide separates the two so you know which questions to put to the airline.

Last verified 2 November 2026Source: 14 CFR Part 382, Subpart E (eCFR)

Pet, emotional support animal or service animal?

Under the Department of Transportation's disability rule, 14 CFR Part 382, a service animal is a dog, of any breed or type, that is individually trained to do work or perform tasks for a person with a disability, including a psychiatric disability. The same definition says that other species, emotional support animals, comfort animals, companionship animals and service animals in training are not service animals for the purposes of that rule.

That one definition sorts every animal into two groups:

• Trained service dogs travel under federal rules. The airline cannot charge for them, and its options for refusing or restricting them are limited (see below).
• Everything else, including emotional support animals, travels under the airline's pet policy. The airline can choose whether to accept the animal at all, charge a fee, cap the number per flight and set the carrier rules.

If your animal is an emotional support animal, plan the trip as a pet trip. Since the DOT rule change published in December 2020, a letter from a health professional no longer brings an emotional support animal into the service animal rules.

What the airline decides for pets in the cabin

Because pet carriage is an airline policy, it can differ between carriers and change without notice. Before booking, find the airline's pet page and confirm each of these:

• Which animals are accepted. Many airlines limit in-cabin pets to small dogs and cats; some accept other small animals, some do not.
• The carrier. The pet has to stay in a carrier that fits under the seat in front of you. Airlines publish maximum carrier dimensions, and these can differ by aircraft.
• How the carrier counts against your bags. On JetBlue, for example, the fare rules say an approved pet carrier counts as your personal item and you may still bring a carry-on bag. Other airlines set this differently, so check, especially on a basic fare.
• The fee and how to pay it. Pet fees are set by the airline and can apply to each flight or each direction. We do not quote them here because they change; use the airline's page.
• How many pets per flight. Airlines that accept pets in the cabin generally limit the number on each flight, which is why the pet is added to the booking in advance rather than declared at the airport.
• Route limits. Some destinations do not accept pets arriving in the cabin, and rules for international flights are often stricter than domestic ones.

Seat choice can matter as well: ask the airline which seats you may use with a pet carrier, because not every seat has under-seat space you are allowed to use. If you have not chosen a fare yet, our Basic Economy vs Main Cabin and baggage fees compared guides explain how bag and seat rules differ between fares.

Getting your pet through TSA screening

TSA allows small pets through the checkpoint and leaves the decision on whether they can fly to the airline. The screening steps TSA describes are:

1. Bring the pet to the checkpoint in a hand-held travel carrier.
2. Take the pet out of the carrier just before screening begins. Never put an animal through the X-ray machine.
3. Put the empty carrier on the belt to be X-rayed. Carriers may also get a visual or physical inspection.
4. Carry the pet through the walk-through metal detector or, if the officer agrees, walk it through on a leash. Take the leash off if you are carrying the pet.
5. Expect an officer to swab your hands for explosive traces.
6. Put the pet back in its carrier at the re-composure area away from the checkpoint.

If your pet is likely to struggle or bolt when taken out of the carrier, TSA suggests asking for screening in a private room; you are escorted there with the pet still in its carrier. Pet food follows the normal food rules: dry or moist food counts as solid, but wet food must meet the 3-1-1 liquids limit in your carry-on, and TSA says there is no medical exemption for prescription pet food, even for service animals. Our guide on bringing food through TSA covers the general food rules.

If your dog is a trained service animal

The service animal rules in 14 CFR Part 382, Subpart E, give you much stronger protection than a pet policy, in exchange for some paperwork:

• Two questions only. Airline staff may ask whether the animal is required because of a disability and what work or task it has been trained to perform. They must not ask about the nature or extent of your disability or ask the dog to demonstrate its task.
• DOT forms. The airline may require the DOT Service Animal Air Transportation Form, completed on or after the date you bought the ticket. For a flight segment of 8 hours or more it may also require the DOT Service Animal Relief Attestation Form. It cannot ask for other documentation, except to meet the animal health rules of a government.
• Advance notice limits. If you booked more than 48 hours before departure, the airline may ask for the form up to 48 hours in advance. If you booked within 48 hours of departure, it may only ask you to hand the form in at the gate.
• No physical check-in requirement. The airline cannot make you check in at the airport instead of online just because you travel with a service animal.
• Where the dog sits. The airline must let the dog travel on your lap or in your foot space unless that would breach safety rules or encroach on another passenger's space. It does not have to carry more than two service animals for one passenger.
• Control and behaviour. The airline may require the dog to be harnessed, leashed or tethered. It may refuse a dog that poses a direct threat or causes a significant disruption, but it must make an individual assessment that is not based on breed, and give you a written statement of the reason for any refusal.

Our special assistance page covers the wider disability rules, including wheelchairs and medical devices, and the airline Complaints Resolution Official you can ask for at the airport.

Bringing a dog into the United States

Entry rules for dogs come from the Centers for Disease Control and Prevention, not the airline, and they apply to US dogs coming home as well as to dogs from abroad. CDC's current rules took effect on 1 August 2024. For a dog that has been only in countries CDC treats as dog rabies-free or low-risk during the six months before arrival, CDC lists these requirements:

• The dog must be at least 6 months old when it enters or returns to the US.
• It must have a microchip that can be read by a universal scanner.
• You must complete the CDC Dog Import Form online for each dog. The form is free, can be done on the day of travel, and the emailed receipt is shown to the airline or to customs officers. CDC says the receipt is valid for six months for repeat entries as long as the dog has not been in a high-risk country in that time.
• The dog must appear healthy on arrival.

A dog that has been in a high-risk country in the previous six months faces stricter rules, which depend on whether it was vaccinated against rabies in the US or abroad, and CDC says a dog from a high-risk country that is not vaccinated against rabies will not be allowed to enter. Use CDC's Dog Importation Navigator to see which set applies. Cats and other animals have separate CDC and USDA rules, and your destination state may have its own. For travel out of the US, the destination country's rules apply, and the USDA's pet travel pages explain the health certificates many countries ask for.

How to book a flight with a pet in the cabin

1. Read the airline's pet policy first. Confirm the animal, carrier size, fee, route and any age or health conditions before you buy the ticket.
2. Add the pet to the reservation early. Do this at booking or as soon as the airline allows, since in-cabin pet spaces on a flight are limited.
3. Check the whole itinerary. On connecting trips and codeshares, check the pet rules of every airline that operates a flight on the ticket, because they may not match.
4. Choose a seat the airline allows with a pet. You need under-seat space in front of you for the carrier.
5. Prepare documents. For international trips, complete the CDC Dog Import Form for the return, and any health certificates the destination requires.
6. Practise the carrier. Let the pet get used to its carrier before the trip, and plan for the moment at the checkpoint when it has to come out.

Common questions

Sources

• 14 CFR 382.3, Definitions: service animal (eCFR)
• 14 CFR Part 382, Subpart E, including 382.72 to 382.80 on service animals (eCFR)
• TSA: Small pets
• TSA: Tips on traveling with pets through a security checkpoint
• TSA: What Can I Bring? Food (pet food entries)
• CDC: Bringing a dog into the United States
• CDC: Dogs arriving from dog rabies-free or low-risk countries
• JetBlue: Our fares (pet carrier and personal item)

General information, not veterinary or legal advice. Trailisse is an independent travel agency and is not affiliated with any airline; the airline, TSA, CDC and the destination country are the authority.