The Southwest Airlines Pet Policy is designed to make traveling with small pets convenient and safe. Passengers are permitted to bring small, vaccinated cats or dogs in the aircraft cabin on domestic flights only. Pets must remain in an airline-approved carrier that fits beneath the seat, and each passenger may bring only one carrier. A non-refundable pet fare applies, and reservations are accepted on a first-come, first-served basis due to limited space. Southwest does not allow pets in the cargo hold or on international flights. Reviewing the Southwest Airlines Pet Policy before booking helps ensure all guidelines are met for a smooth travel experience with your pet.