What size dog can fly on southwest?
Score: 4.8/5 (65 votes) Your pet carrier must be able to fit under the seat in front of you. Acceptable pet carriers include the Southwest Airlines Pet Carrier (17” long x 9.5” high x 10” wide), and other pet carriers with maximum dimensions of 18.5” long x 8.5” high x 13.5” wide. What types of pet ...