United Airlines Policy on Dogs: 2026 Guide to Cabin Rules, Fees and Paperwork

United Airlines policy on dogs, in short: As of September 2026, United Airlines accepts small dogs only in the passenger cabin. The dog must travel in a carrier that fits completely under the seat in front of you, and the pet fee is $150 each way. United has kept its PetSafe cargo program closed to the general public since 2018, so a large dog cannot fly United unless it is a trained service dog. Service dogs fly free under U.S. Department of Transportation rules.

The United Airlines policy on dogs is the set of rules United uses to decide which dogs can fly, where they sit, which carrier they need, what they cost and which routes are off-limits. This guide goes through each rule and points out where published guides contradict each other. It also separates United's own requirements from federal entry rules set by the Centers for Disease Control and Prevention (CDC) and the United States Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS).

How we researched this: On 27 September 2026, the Animal Passport editorial team tried to load United's official pet-travel pages, but they would not load from our research environment. We cross-checked every United-specific figure below against several independent guides that quote united.com, and we flag any disagreements. Government rules come straight from CDC, USDA APHIS and U.S. Department of Transportation (DOT) sources. Always confirm your booking with United, because airline rules can change without notice.

United Airlines dog policy at a glance (September 2026)

Which dogs can fly in the cabin on United?

United carries only cats and dogs as in-cabin pets, and the carrier must stay under the seat with the door closed for the whole flight, according to Borderless Moves' 2026 summary of United's pet page. The same summary says United publishes no weight or breed limit for cabin pets. That contradicts the "20 lb limit" some older articles repeat. What matters in practice is whether your dog can stand up and turn around inside a carrier that still fits under the seat.

Carrier size limits

Every source we reviewed gives soft-sided carriers a maximum of 18 inches long, 11 inches wide and 11 inches high. Hard-sided carriers are less clear. Borderless Moves (2026) lists 17.5 x 12 x 9 inches, while other guides that quote a United booking screen list a height of 7.5 inches. Until United confirms which is correct for your flight, choose a carrier that meets the smaller 7.5-inch figure, or use a soft-sided bag that can compress to fit.

How many dogs can you bring?

Borderless Moves (2026) reports that United allows up to two pets per passenger if you buy two adjacent seats. The limit drops to one pet per passenger on some narrow-body aircraft: the Airbus A319, A320 and A321neo, the Boeing 737-800 and 737 MAX 8, and the Boeing 737-900 and 737 MAX 9. Each pet needs its own carrier, and both carriers still go under the seats, not on them. United also caps the total number of pets on each flight. Sniffspot's guide says that cap depends on aircraft type and cabin, so book your dog early.

Where your dog cannot sit

According to Borderless Moves (2026), United does not allow pets in emergency exit rows, in United Premium Plus, or in the front row of any cabin, because those seats have no under-seat storage in front of them. Keep this in mind before paying for a seat upgrade.

Minimum age

Borderless Moves (2026) reports a minimum age of 2 months for domestic flights. For international flights, dogs must be 6 months old. Other guides give 16 weeks for international travel. The CDC's own rule, described below, requires dogs entering the United States to be at least 6 months old, so plan around 6 months for any trip back into the U.S.

How much does United charge to fly with a dog?

United's in-cabin pet fee is $150 each way, per pet, according to Borderless Moves (2026). Sniffspot reports that United raised the fee from $125 to $150 for tickets bought after April 26, 2024. That explains why older articles still quote $125.

An extra charge applies when your itinerary includes a layover of more than 4 hours within the United States or more than 24 hours outside it. Third-party guides disagree on the amount: some say $125, others say $150. Ask the United agent to state the total pet charge for your exact itinerary before you pay. Trained service dogs pay no pet fee (DOT, 2020).

Can a large dog fly on United Airlines?

No, not unless it is a trained service dog. United suspended new reservations in its PetSafe cargo program on March 20, 2018, after a series of incidents involving pets, and has not reopened it to the public (Wikipedia; CertaPet). Borderless Moves (2026) quotes United's current page as saying, "We no longer let you check your pets through the PetSafe program." The only exception is for active-duty U.S. military personnel on permanent change of station (PCS) orders and State Department foreign service officers, including their spouses.

If your dog is too big for an under-seat carrier, your realistic options are:

• a licensed professional pet shipper that books manifest cargo on other airlines;
• a different airline that still carries pets in the hold; or
• ground transport.

Service dogs vs. emotional support animals on United

United follows the DOT's Air Carrier Access Act (ACAA) rule, published in the Federal Register on December 10, 2020, which took effect in January 2021. That rule defines a service animal as "a dog, regardless of breed or type, that is individually trained to do work or perform tasks for the benefit of a qualified individual with a disability." It also lets airlines treat emotional support animals as pets.

Under 14 CFR Part 382, as shown in the Electronic Code of Federal Regulations (eCFR) in 2026, the rule works like this:

• Two-dog limit. Airlines do not have to accept more than two service animals for one passenger.
• DOT forms. Airlines can require the DOT Service Animal Air Transportation Form. If you booked more than 48 hours before departure, they can ask for it up to 48 hours in advance.
• Long flights. For flight segments scheduled to last 8 hours or more, airlines can require an extra DOT form confirming that the dog can avoid relieving itself or can do so in a sanitary way.
• Space and control. Service dogs must fit within the handler's foot space or lap and stay harnessed, leashed or tethered.

Emotional support animals, comfort animals and service dogs in training fly as ordinary pets on United. That means they need the carrier and pay the $150 fee.

Routes where United does not accept pets

Many countries require animals to arrive as manifest cargo, and some quarantine-controlled destinations do not allow in-cabin arrival at all. For these reasons, United does not carry pets to, from or through a long list of places. Borderless Moves' 2026 list includes:

• Pacific and Oceania: Australia, New Zealand, Hawaii, Guam, Palau, the Marshall Islands, Micronesia, the Northern Mariana Islands (Saipan) and French Polynesia (Tahiti).
• Europe: the United Kingdom, Ireland, Iceland, Sweden and Spain.
• Caribbean and Latin America: Barbados, Brazil, Cuba, Dominica, the Dominican Republic, Guyana, Jamaica, Saint Kitts and Nevis, and Trinidad and Tobago.
• Africa and the Middle East: South Africa, Morocco and the United Arab Emirates (Dubai).
• Asia: Hong Kong, Mongolia, Taiwan, Thailand, Vietnam and the Philippines.

Lists in other guides do not always match. Some add countries, and some restrictions only apply to certain routes. Treat any published list as a starting point and check your exact routing with United.

What documents does a dog need to fly United?

Flying into or back into the United States

The CDC is the main authority for dogs entering the U.S., according to the USDA APHIS pet travel page (last modified March 20, 2026). Starting August 1, 2024, the CDC says that for a dog that has been only in dog-rabies-free or low-risk countries during the previous 6 months, the only required document is the CDC Dog Import Form. The form is free, each dog needs its own form, and the receipt is valid for 6 months. The dog must also:

• look healthy when it arrives;
• be at least 6 months old; and
• have a microchip that a universal scanner can read.

Dogs that have been in a high-risk country for dog rabies face stricter requirements. A dog that has been in a high-risk country in the past 6 months and is not vaccinated against rabies will not be allowed into the U.S., according to the CDC (2024). If your dog was vaccinated in the U.S. and is visiting a high-risk country, USDA APHIS (2026) says a USDA-accredited veterinarian must submit the Certification of U.S.-Issued Rabies Vaccination form before the dog leaves the country.

Flying out of the United States

USDA APHIS (2026) advises owners to contact a USDA-accredited veterinarian as soon as they decide to travel abroad. The vet can identify the destination country's entry requirements and help obtain a USDA-endorsed health certificate. Borderless Moves (2026) reports that United's page also asks for rabies vaccination at least 28 days before international travel. It adds that USDA may require a certificate for dogs coming from areas where screwworm is present.

How to book a dog on United: step by step

1. Check the route. Make sure no airport on your itinerary is on United's pet-restriction list.
2. Measure your dog and carrier. Your dog must be able to stand and turn around, and the carrier must meet the stricter hard-sided height or the 18 x 11 x 11 inch soft-sided limit.
3. Book your seat, then add your pet. Add the pet at booking or soon after, because each flight has a limited number of pet spaces. Avoid exit rows, United Premium Plus and front-row seats.
4. Confirm the total fee. Expect $150 each way, plus a layover charge if any connection runs longer than 4 hours in the U.S. or 24 hours abroad.
5. Prepare the paperwork. For U.S. entry, get the CDC Dog Import Form receipt and check the microchip. For departures, arrange the destination country's health certificate through a USDA-accredited veterinarian.
6. Service dog users: Complete the DOT Service Animal Air Transportation Form, plus the relief form for segments of 8 hours or more, if United asks for them.
7. On travel day: Check in with an agent if United asks you to, and keep your dog in the closed carrier in the airport and on board.

Airline pet paperwork vs. Animal Passport: not the same thing

People searching for United's dog rules often come across the term "pet passport." The European Union pet passport, the United Kingdom's pet travel rules and U.S. documents like the CDC Dog Import Form are official government documents. So are USDA-endorsed health certificates. Airlines like United check these documents, or refer you to them, at check-in and at the border.

Animal Passport is a different kind of product. It is a digital identity record for animals and livestock that uses muzzle biometrics: an animal's nose print is unique, much like a human fingerprint. With a phone camera, the record links an animal to its owner, breed, estimated age, body condition and vaccination history. It can estimate age from a dental photo, with a confidence score, and give a body condition score from 1 to 5 based on a side-profile photo. During the August 2025 floods in Pakistan, farmers used it to reclaim livestock after paper ear tags washed away.

Animal Passport is not a government-issued travel document. It does not replace the CDC Dog Import Form, a microchip, a rabies certificate, a USDA-endorsed health certificate or a DOT service animal form, and it does not give veterinary or legal advice. For airline travel, follow the official rules above. For more on animal identity and traceability, see the Animal Passport blog.

Bottom line

As of September 2026, flying United with a dog means flying small, in the cabin and for a fee. Your dog needs an under-seat carrier and costs $150 each way, and some routes are off-limits. Large pet dogs cannot fly United at all, while trained service dogs fly free under DOT rules. The biggest risks are mismatched carrier heights, unexpected layover charges and missing CDC paperwork. Check all three with the official sources before you get to the airport.