Southwest Airlines allows to travel small domestic pets such as cats and dogs in the cabin on most flights. Southwest Airlines pet policy 1-800-364-9405 limits the number of pet carriers to 6 per flight. Southwest airlines Pet reservations are accepted on a first-come, first-served basis, so you should reserve as soon as your travel plans are confirmed. You can contact to the Southwest airlines customer service 1-800-364-9405 to get all detailed information about Southwest airlines Pet Policy and agents are there to assist you 24*7.