Southwest Airlines Pet Policy
Southwest Airlines allows small vaccinated cats and dogs who are at least 8 weeks old to fly in the cabin under a seat on domestic itineraries. Of course, it’s not quite that simple as there are other regulations to follow and even a few exceptions to the rules.
Most Southwest flights will allow up to 6 pet carriers in the cabin, however, some circumstances may reduce or even increase this number. Each customer is allowed 1 pet carrier (with a maximum of 2 pets of the same species) per flight. Pet reservations are on a first come, first served basis.