Does frontier airlines allow pets within the cabin for domestic travel. Small dogs, cats, guinea pigs, rabbits, hamsters, and housefowl are allowed as long as they are in a carrier that fits beneath the seat in front of you and is soft-sided, leak-proof, and well-ventilated. The pet and carrier combined cannot weigh more than forty pounds. A non-refundable one-way pet fee applies. On overseas flights, pets are not permitted to be checked as checked baggage. If a service animal satisfies certain requirements, it is permitted without charging extra. For the length of the journey, you must keep your pet confined within the carrier and follow all carrier guidelines.