United Airlines Pet Policy for Dogs and Cats

United publishes its pet policy on its traveling with pets page, and that is where to read the fee, the carrier sizes and the rules by aircraft and seat before you book, rather than in a summary. This guide sets out what to check there, and what to do if your pet is too large for the cabin.

Four things decide a booking on United: whether your pet can travel in the cabin or in cargo, the carrier size for the aircraft on your itinerary, which seats allow a pet, and any vaccination timing the airline sets before an international flight. Check each on United’s page.

Check United’s pet fee on the same page, whether it is charged each way, and what a second pet adds, before you book.

A second pet can change the seating as well as the total, so check United’s rule for another animal before you choose where to sit.

American, Delta and JetBlue each cap the pets on a flight. Check United’s page for its own limits, and add the pet at the moment you book yourself rather than afterwards.

Check United’s carrier sizes on its pets page against the aircraft on your itinerary as well as any general figure, and measure your pet before you buy a carrier. Our pet carrier size checker sets IATA’s minimum for your dog or cat beside the under-seat limits that US and Canadian airlines publish.

A carrier bought to one limit can be refused elsewhere, so buy for the airline and the aircraft you are actually flying.

The honest test is whether your pet can stand, turn around and lie down inside a carrier that meets United’s size limit. Measure the animal, then buy the carrier, and do both before booking rather than after.

Check United’s page for any seats closed to a passenger traveling with a pet. The carrier has to fit under the seat in front of you.

If any leg of your itinerary is operated by a regional partner, confirm that leg’s pet rules with the airline before you book the whole trip.

If your dog is above cabin size, check first on United’s own pages whether it carries pets in cargo, and for whom.

That answer decides whether the airline can be part of the plan at all, so settle it before choosing a carrier.

The consequence is that your dog’s size chooses the airline before anything else does. Which carriers accept animals in the hold as manifest cargo depends on the route. If your dog is above cabin size, the useful question is which carrier flies your route with a live animal program. American Airlines Cargo carries pets for the general public through its PetEmbark service, set out in our American Airlines pet policy guide. Our Delta pet policy guide and JetBlue pet policy guide cover two other carriers, and our guide to what it costs to ship a dog explains how cargo is priced once you are in that market. Our airline crate size calculator works out IATA’s minimum inside dimensions for your dog or cat’s travel crate.

If you are moving on military or State Department orders, check United’s own pages for any program that covers your route before planning around it.

Any such program sets its own eligibility, routes and crate rules, so plan from the airline’s page rather than from a summary.

Ask United which documents it needs and how the booking is made, and allow time for both.

If your pet is flying to Hawaii on any airline, our Hawaii pet quarantine guide sets out what that involves and how far ahead it starts.

Check United’s pets page for its breed and age rules, for your pet and your route, before you book.

The CDC requires a dog entering or returning to the United States to be at least six months old when it arrives, including a dog coming home from a short trip.

That rule reshapes plans for a young dog that will come back to the United States, because the age is counted on arrival.

For an international flight, check United’s pets page for any document and vaccination requirements of its own, alongside your destination’s rules.

Check any vaccination timing the airline sets against the destination’s own timeline, because the later of the two decides your earliest travel date.

Our Mexico guide covers the entry rules for a dog flying there.

Dogs arriving into the United States face the CDC’s current import rules, and from some regions a USDA screwworm certificate as well. Our APHIS pet travel guide covers the endorsement side of that.

United’s pets page is where to check how to add a pet to a booking. Do it when you book yourself.

Its check-in steps for a pet are the next thing to confirm, so you know where to go at the airport and how early.

If you are traveling with an emotional support animal or a service dog, check how United classifies it before you book.

On board, follow the airline’s rules for where the carrier goes and when it stays closed.

Most of our work on a United route is deciding whether United is the right carrier at all, and that decision is usually made with a tape measure. We measure the animal, check it against the carrier limit for the specific aircraft on the itinerary rather than the general published limit, and say plainly when the answer is that United cannot carry this dog. That answer arrives faster and costs less than discovering it at a kiosk.

Where United does work, the coordination is about sequencing rather than volume of paperwork. The airline’s own vaccination timing, the destination’s rules and the place on the flight each set a date. We hold those three against each other and work backwards from the arrival date rather than forwards from today.

Our team holds IATA Live Animals Regulations certificates. Documentation for departures from the United States follows USDA APHIS requirements.

Check United’s own pages first for whether it carries pets in cargo, and for whom. If your dog does not fit under the seat, look at airlines with a live animal cargo program on your route. American Airlines Cargo carries pets for the general public through its PetEmbark service.

Check United’s traveling with pets page for its pet fee, whether it is charged each way, and what a second pet adds, before you book.

Check United’s pets page for its limits per passenger and per flight, for the aircraft on your itinerary, before you book.

Check United’s pets page for its breed rules, for the cabin and for any cargo program, before you book.

The CDC requires a dog entering or returning to the United States to be at least six months old when it arrives, including a dog coming home from a short trip. United’s pets page is where to check the airline’s own age rules.

United’s pets page is where to check how to add a pet to a booking, so look there before searching the app for the option.

This guide gives no figure for the airline: united.com could not be read for it when it was checked in September 2026, or when its pets page was tried again on October 14, 2026, so the fee, the carrier sizes and the other limits are left to the airline’s own pets page. The CDC age rule comes from the CDC’s dog import pages, read on September 16, 2026. Airline pet policy changes more often than almost anything else in this field, so confirm the fee and the carrier limit with United before you book.