JetBlue allows small dogs in the cabin only, for a fee of $150 each way, and the hard limit is size: the combined weight of your dog and the carrier cannot exceed 20 pounds, and the carrier can’t exceed 17 inches long by 12.5 inches wide by 8.5 inches high.

There is no workaround for bigger dogs.

JetBlue does not allow any pets in the cargo hold under any circumstances, so if your dog is too large to fit under the seat, you must choose a different airline, with trained service dogs the only exception.

The Fee and How to Book

The $150 fee applies per pet, per flight segment, is non-refundable, and gets added in the Extras section when you book online or in the JetBlue app.

Book the pet the moment you book your ticket, because only six pets are allowed per flight, and once those spots fill, no amount of pleading at the gate creates a seventh.

A maximum of two pets per traveler is allowed, each in their own carrier, and bringing a second pet requires buying a second seat and paying a second pet fee.

One small consolation for the cost: TrueBlue members earn 300 extra points per segment for adding a pet to their booking.

Carrier Rules They Actually Enforce

JetBlue is stricter than most airlines about checking, and airport staff will actively verify that your carrier fits the size limit and that your pet can comfortably stand and turn around inside it, denying boarding if the dog looks crammed in.

Soft-sided carriers are the smart choice since they compress to fit under-seat space, and agents sometimes do physical fit tests, not just visual checks.

Your pet and carrier count as one personal item, so pack accordingly, and the carrier must stay closed at the airport and under the seat in front of you during taxi, takeoff, and landing, though you can hold the carrier on your lap during the flight.

Age, Health, and Seat Restrictions

Dogs must be at least eight weeks old for travel within the U.S. and Puerto Rico, and at least 16 weeks old when flying into the U.S. from abroad.

Health paperwork depends on where you’re going: vaccination requirements vary by state, and Puerto Rico and the U.S. Virgin Islands require vaccination documentation, so check your destination’s rules before you fly.

Seat choice matters more than people expect.

Travelers with pets can’t sit in emergency exit rows, bulkhead seats, Mint, or any seat with restricted under-seat stowage, and pets are barred from interline and codeshare bookings entirely.

Emotional support animals get no special treatment anymore: under Department of Transportation rules, ESAs fly as regular pets with the full fee, while trained service dogs fly free after submitting the DOT form at least 48 hours before departure.

Airport Day, Step by Step

Arrive early, at least two hours before a domestic flight, because pets can’t use standard online-only check-in alone: after checking in, visit the full-service counter to get the JetPaws bag tag attached to your pet’s carrier.

At TSA, you’ll remove your dog from the carrier and carry or walk them through screening while the empty carrier goes through the X-ray machine, so practice calm in-arms carries before travel day.

Pet strollers can be checked for free at the ticket counter or gate if you use one, and if your dog needs a bathroom break during a connection, look for the airport’s pet relief area, though at some airports you’ll need to exit and re-clear security.

Flying out of Harry Reid International, give yourself extra buffer: the pet relief areas are outside security on the departures level and post-security in the C and D concourses, and a pre-flight walk in Vegas heat means bringing water for the wait at the counter.

The single best tip: call JetBlue right after booking to confirm your pet’s reservation is attached to your ticket with an SSR code, because the six-pet limit is enforced per flight, and a fee paid without a confirmed spot is how dogs get denied at the gate.