Discover Southwest's pet-friendly guidelines to make sure your four-legged pals travel comfortably. modest dogs and cats are welcome to travel with you in the cabin under Southwest pet policy for a modest cost. Your pet will have a stress-free travel with cozy chairs and caring personnel. For particular criteria, such as carrier size and health regulations, visit the Southwest website. Travel in confidence knowing that Southwest has your pet's best interests in mind. View Southwest Airlines "pet policy'' for more information. For further information, contact customer service at 800-435-9792 OTA-Skip Waiting) or (844) 902-4930, or read the blog post on the Airlines Pet Policy website.