<p style="font-size: medium;" data-start="189" data-end="271">Before flying with your furry companion, review the official southwest airlines pet carrier policy to avoid airport issues. <span class="hover:entity-accent entity-underline inline cursor-pointer align-baseline">Southwest Airlines</span> requires pets traveling in the cabin to remain inside an approved carrier that fits under the seat in front of you. The maximum carrier dimensions are 18.5&rdquo; x 13.5&rdquo; x 9.5&rdquo;, and it must be leak-proof and well ventilated. A $95 fee per carrier applies each way on domestic flights. Only one carrier per passenger is permitted, with a limit of six carriers per flight. Early reservations are recommended due to limited availability.