If you're planning to fly with your pet on Southwest Airlines, it's important to know their rules about pet carriers. Only small cats and dogs are allowed in the cabin, and they must stay inside a carrier for the entire flight. The carrier needs to fit under the seat in front of you, so it should be a soft-sided, well-ventilated bag that keeps your pet safe and comfortable. Your pet should have enough space inside to sit, lie down, and turn around easily. To avoid any problems at the airport, always check that your carrier meets the official Southwest Airlines pet carrier dimensions. This makes the journey smoother for both you and your furry friend.

https://www.airlinesticketoffice.com/blog/southwest-airlines-pet-carrier/