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Southwest Airlines Pet Policy allows small vaccinated domestic cats and dogs to travel in-cabin with their owners. Pets must be carried in approved pet carriers that fit under the seat. The pet fare is $95 each way, and pets are accepted on a first-come, first-served basis. Each passenger may bring only one pet carrier, which can contain up to two pets of the same species. Southwest Airlines Pet Policy does not allow pets in cargo. Passengers should arrive early for check-in and ensure their pets remain inside the carrier at all times. Service animals follow different guidelines than regular pets.