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The Southwest Airlines Pet Policy ensures that pet owners can travel with their small dogs or cats on domestic flights, provided they meet specific requirements. Pets must be vaccinated and transported in an airline-approved carrier that fits under the seat in front of the passenger. Only one carrier per passenger is allowed, and a pet fare must be paid for each. While Southwest Airlines welcomes pets in the cabin, it does not allow them to fly in cargo or on international routes. To avoid any last-minute issues, it’s best to review the Southwest Airlines Pet Policy in advance and secure a reservation early, as pet space is limited on each flight.