Quick answer: Allegiant carries small domestic dogs and cats in the cabin, in a carrier that fits under the seat in front of you. There is no cargo and no checked-baggage option for animals. Two restrictions narrow it further and decide most bookings: pets travel only on flights within the contiguous 48 states — not to Hawaii, not to US territories, not internationally — and every carrier is physically inspected at the ticket counter before you are checked in. Call a travel expert at Fond Travels on +1 (323) 800 6001 and we will confirm whether your route and your animal qualify.
Details reflect what was published at the time of writing. Carrier dimensions and charges change, so confirm them for your booking.
Where pets can and cannot go
- Within the lower 48 states: small dogs and cats in the cabin.
- Hawaii: not available for pets. Only service dogs, and those must meet Hawaii's own import requirements, which are substantial.
- US territories: not available.
- International destinations: not available.
- Cargo or checked baggage: not offered, anywhere, for any animal.
That first bullet is the whole policy. If the route is not between two cities in the contiguous 48, the conversation is about a different airline, and that is worth establishing before you compare fares.
The carrier inspection, which is unusual and worth preparing for
On most airlines a pet carrier gets a glance. Here it is checked properly at the ticket counter before you are issued a boarding pass.
What that means in practice:
- You cannot check in online and walk to the gate. Build the counter visit into your timing.
- Arrive at least an hour before departure, and more at a busy airport, so an agent has time to look at the carrier and confirm it complies.
- A carrier that fails is a refusal at the counter, not a conversation at the gate. There is no hold to fall back on.
- Bring the carrier you intend to use, packed as you will actually travel, rather than an empty one you plan to fill.
This is genuinely a good thing for anyone who prepares — the problem is found at a desk with time to think rather than at a gate with a boarding call running. But it only works in your favour if you arrive early enough for it.
Carrier requirements
The published maximum sits around 8 inches high by 14 wide by 18 long, and soft-sided is strongly preferred over hard-sided. Older third-party pages quote different figures, so take the dimensions from the airline rather than from a comparison table.
Beyond size, the carrier has to:
- Be enclosed and leak-proof, with a waterproof bottom and an absorbent pad inside.
- Have ventilation on at least three sides.
- Let the animal stand up and turn around comfortably. This is checked, and a carrier within the dimensions can still fail it.
- Fit under the seat in front of you and stay there for the flight.





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