United no longer checks pets through PetSafe, and that single change rewrites the answer for anyone with a large dog. Cargo is now limited to certain active-duty military and State Department travellers. For everyone else the cabin is the only route, which means the dog has to fit under the seat. Pixel would manage it; a 30kg shepherd will not.

United Airlines's pet policy splits into cabin and cargo. This page summarizes the weight limits, fees, brachycephalic-breed restrictions, and carrier specifications for both modes — sourced from the airline's official pet pages.

How United Airlines handles your pet

Each fact comes straight from the operator’s published policy. Tap the to read the exact wording; the opens the source page.

In the cabin Accepted
In the hold / cargo Accepted
Snub-nosed breedsAccepted

Cabin policy

Pets accepted Acceptedverified 2026-10-17
Snub-nosed breeds banned Noverified 2026-10-17
One-way fee150 USDverified 2026-10-17
Minimum age26 weeksverified 2026-10-17
Advance booking required Yesverified 2026-10-17
Max pets per passenger2verified 2026-10-17
Booking methodonlineverified 2026-10-17
Banned destinations Yesverified 2026-10-17
Carrier size44 × 30 × 22 cmverified 2026-10-17
Crate must have/behard-sided ok, soft-sided ok, ventilated, a carrierverified 2026-10-17

Hold & cargo policy

Hold: Pets accepted Not acceptedverified 2026-10-17
Cargo: Pets accepted Acceptedverified 2026-10-17
Cargo: Booking methodemailverified 2026-10-17
Cargo: Crate must have/beventilatedverified 2026-10-17

Health & documents

Health certificate required Yesverified 2026-10-17

Service & assistance animals

Esa noteUnited does not recognise emotional support or therapy animals. Only dogs individually trained to perform tasks for a person with a disability count as service animals; therapy and emotional-support cats and dogs fly as ordinary pets, in a carrier, under the standard pet policy and fee. No other species is carried at all.verified 2026-10-17
Fee waived Yesverified 2026-10-17
Recognized Yesverified 2026-10-17
Cabin allowed Yesverified 2026-10-17
Esa recognized Noverified 2026-10-17
Forms requiredTwo United forms, depending on flight length: the Service Animal Training and Behavior Attestation Form for every flight, plus the Service Animal Relief Attestation Form for flights of 8 hours or more.verified 2026-10-17
Max pets per passenger2verified 2026-10-17
Breed restrictionsNone stated. United restricts the SPECIES — only dogs qualify as service animals — and sets a minimum age of 4 months on domestic flights and 6 months on international, but names no breed.verified 2026-10-17
Documentation requiredA health and vaccination certificate is required for all international flights, including Canada and Mexico. Some international destinations also require the dog to have been trained by a recognised accredited organisation. Dogs in training are not accepted.verified 2026-10-17
Recognized organizationsUnited names no specific accrediting body: it states only that some international destinations require training by a recognised accredited organisation.verified 2026-10-17

Exceptions to the standard rules

Cases where the rules differ from the ones above.

  • Active-duty US military (PCS) / State Department FSP and spouses — United pet exemption; cargo service runs Guam–Honolulu source

    United states it has pet exemptions for U.S. military on permanent change of station and their spouses, and for State Department Foreign Service Officers and their spouses. The cargo service that implements them runs ONLY between Guam (GUM) and Honolulu (HNL) — on every other route United carries no pets in cargo at all. Book by emailing militarypets@united.com 5–10 days ahead with your itinerary, active PCS orders, a health certificate dated within 10 days of travel and a signed acknowledgement form. One pet move per PCS order; personal pets only. The crate must meet USDA and IATA rules — no 700-series crates and nothing over 34 in / 86.4 cm tall. Up to 4 pets GUM→HNL, 2 pets HNL→GUM.

On international flights dogs must be at least 26 weeks old to meet CDC requirements, against 2 months on domestic flights and 4 months for kittens. The threshold changes with the itinerary rather than with the animal. Check which rule your routing falls under before booking, because a domestic-legal puppy is refused on an international sector.
There are no weight or breed limitations for pets in the cabin, so no brachycephalic ban applies, but the animal must travel in either a hard-sided or soft-sided carrier. Only service animals are allowed on board without a carrier. Choose the carrier to fit the underseat space rather than the animal, since the carrier is the constraint that remains.
A pet in the cabin costs 150 USD each way, charged per animal and per direction, so a return trip is 300 USD before the human fare. Space is subject to availability, which means the fee buys a place only once the booking is accepted. Pay it at booking rather than at the airport and keep the confirmation.
United is now a cabin-only carrier for ordinary travellers, and that reframes the whole decision: if the dog does not fit under the seat, this is the wrong airline rather than the wrong crate. Build your plan around the carrier dimensions and the 150 USD each way, and confirm the military or State Department exception applies before relying on cargo.
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Glossary

ISO chip
ISO 11784/11785 — the universal microchip standard.
FAVN
Fluorescent Antibody Virus Neutralization — a rabies serology test required by rabies-free destinations.
Brachycephalic
Snub-nosed breeds (French Bulldogs, Pugs, Persians, Himalayans) with restricted airline acceptance due to heat-stress risk.
AVIH
Animal Vehicle In Hold — IATA's term for cargo pet shipment, with fees that vary by carrier and route.