Southwest Airlines has a pet-friendly policy, known as the Southwest pet policy, allowing passengers to travel with their pets on board. Small dogs and cats are welcome in the cabin, provided they meet the guidelines set by the Southwest pet policy. Pets must be kept in a carrier that fits under the seat, ensuring their safety and the comfort of fellow passengers. Advance reservations are recommended due to limited availability for pets on each flight. Before booking a flight for your pet, you must visit the airlinespetpolicy website once to get complete information about the pet policy.