The Southwest Airlines Pet Policy makes it easy to bring your furry companion along for the ride. Only small dogs and cats that are vaccinated can travel in the cabin in a secure, airline-approved carrier. Carriers must fit under the seat, and pets must remain inside throughout the flight. A nonrefundable pet fee applies per trip, and space is limited, so book early. Pets are not permitted in the cargo hold. For a smooth travel day, review all pet requirements in advance. With the Southwest Airlines Pet Policy, your pet can enjoy the journey right by your side.