Yes, Frontier Airlines allows small pets in the cabin on most domestic flights. Acceptable pets include cats, dogs, rabbits, guinea pigs, hamsters, and small household birds. Pets must travel in an approved soft-sided carrier that fits under the seat in front of you. There’s usually a pet fee (around $99 each way), and only a limited number of pets are allowed per flight. Frontier does not permit pets in checked baggage or on international flights. Always review their latest pet policy online before flying to ensure compliance with size and health requirements.