The Southwest airline follows the first-come-first-service policy as the seats for pets is limited per flight and passengers should book tickets for their pets as early as possible to get a guaranteed seat for their four-legged friend.
Passengers are permitted to bring small domestic dogs and cats to the plane's interior cabin aircraft. Southwest airline's pet policy states that cats and dogs must be well-vaccinated. Pets must be within the passenger's seat of an approved vehicle as per the guidelines. Animals are not permitted be allowed to travel inside the cabins of international flights. For more details: https://airlines-gethuman.org/blog/southwest-airlines-pet-policy/
