Flying with Pets Through TSA: Rules, Carriers & Emotional Support Animals 2026
Traveling with a pet creates more security complexity than most travelers expect. TSA has specific rules for pet carriers, emotional support animals require careful documentation, and airlines impose restrictions that TSA doesn't enforce. International travel adds another layer of requirements. Understanding what TSA allows, what airlines require, and how to document emotional support animals prevents delays, confiscation, and missed flights.
This guide covers carrier specifications, breed restrictions, emotional support animal policies, pet food and medication rules, and the documentation needed for international pet travel.
TSA Pet Carrier Requirements at Security
TSA has minimal restrictions on pet carriers themselves. The focus is on what's inside the carrier and whether it passes through security screening.
Carrier specifications: Your pet carrier must fit under the seat in front of you on the aircraft. Typical dimensions are roughly 17 inches long, 12 inches wide, and 8 inches tall. Most soft-sided carriers from major brands (Sherpa, Petmate, Outward Hound) meet this requirement. Hard-sided carriers are equally acceptable.
What TSA checks: At security, TSA officers will ask you to remove your pet from the carrier for screening. Your pet passes through the same screening as a passenger. Cats, dogs, rabbits, and birds are routine. Exotic pets (snakes, spiders, tarantulas) may receive additional inspection.
The carrier itself: TSA runs the empty carrier through the X-ray machine after you remove your pet. Hidden compartments, metal hinges, or magnetic closures may trigger secondary inspection, but this is rare.
TSA does not weigh pets or carriers. Your airline determines if your pet counts as a carry-on item and whether you pay a pet fee (typically $50-150 per flight). TSA's job is security only, not baggage allocation.
Tip: When you reach security, proactively tell the officer you have a pet in the carrier. This alerts them that you'll need to remove your animal. They'll direct you to a safe area away from the checkpoint lanes where you can remove your pet without it running into the security area.
Emotional Support Animals vs. Service Animals
The difference between emotional support animals (ESAs) and service animals is critical for air travel. TSA has no direct role in verifying ESAs—that falls to the airline. But TSA security screening applies equally to both.
Service animals: Dogs or miniature horses trained to perform specific tasks for people with disabilities. Examples include guide dogs for the blind, mobility dogs for people in wheelchairs, seizure alert dogs, and PTSD alert dogs. Service animals are allowed in the cabin without airline charges or restrictions. They do not require documentation from TSA's perspective, though airlines may ask for proof.
Emotional support animals: Pets that provide comfort by their presence but are not trained to perform specific tasks. ESAs are typically dogs, cats, rabbits, guinea pigs, or birds. Under the Air Carrier Access Act, ESAs are allowed in the cabin without charges if you have proper documentation.
ESA Documentation Requirements 2026
To bring an emotional support animal in the cabin, you need a letter from a licensed mental health provider (therapist, psychiatrist, licensed clinical social worker, or psychologist). The letter must:
- Be dated within one year of your flight
- Be written on official letterhead with the provider's license number and contact information
- Confirm that you have a diagnosed mental health disability (anxiety, depression, PTSD, ADHD, OCD, etc.)
- State that the specific animal is necessary for your mental health condition
- Describe the animal (breed, size, color if possible, and name)
- Be signed by the provider
The letter should not be a generic template. Generic, pre-signed letters raise red flags with airlines and TSA.
Many online ESA letter services ($50-300) offer letters from licensed providers. These are legal as long as the provider is actually licensed and has evaluated you. However, fraudulent ESA documentation has become a major problem. TSA and the Department of Transportation increased enforcement in 2024.
Fraudulent ESA Fines: Submitting fake ESA documentation can result in fines up to $7,500 per incident, criminal charges, and a permanent ban from flying with that airline. Some passengers have been banned from all U.S. airlines. Airlines are increasingly asking for documentation verification and consulting with providers directly. If your letter is questionable, expect to be denied boarding.
What Happens to ESAs at Security
At security, TSA treats ESAs like any pet. Your animal goes through screening with you. Unlike service dogs, ESAs are not exempt from X-ray security procedures. You'll be asked to:
- Remove your ESA from its carrier
- Carry your animal through security (they do not go through X-ray)
- Allow TSA to screen the carrier
TSA officers do not verify ESA documentation—the airline handles that before boarding. However, TSA may confiscate items from your animal's bag (treats, toys, or carriers with prohibited items).
Breed Restrictions: Airline Policy, Not TSA
TSA has zero breed restrictions. However, every major U.S. airline has breed bans for pets in cargo.
Airlines with breed bans (cargo only):
- Delta: Bans pit bulls, Staffordshire Terriers, Akitas, wolf hybrids, and Siberian Huskies
- United: Bans pit bulls, Akitas, Chows, Dalmatians, Rottweilers, Siberian Huskies, and wolf hybrids
- American: Bans pit bulls, Akitas, Dalmatians, Rottweilers, and Siberian Huskies
- Southwest: No breed bans, but pets must fit in approved carriers for cabin transport
Critical distinction: These bans apply ONLY to pets traveling in cargo holds. If your dog is in the cabin in a carrier, the breed ban does not apply. You can fly a pit bull or Husky in cabin carry-on on Delta or United.
Other restrictions: Some airlines restrict "aggressive-looking" dogs even if not on official breed bans. Muzzles may be required. Behavioral issues are handled case-by-case. If your animal is prone to barking, aggression, or anxiety, alert the airline in advance.
Pet Food, Water & Medication at Security
Pet supplies have mixed rules at TSA security.
Dry pet food: Unlimited. Dry kibble, treats, and powdered supplements have no restrictions. Pack as much as you need.
Wet/canned pet food: Counts as a gel or paste. The 3-1-1 rule applies. A can of cat food must be 3.4 ounces or less per container if in carry-on. Larger cans must go in checked luggage. Many travelers buy pet food at their destination rather than traveling with large cans.
Pet water: You cannot bring a filled water bowl through security. Water is a liquid. Bring an empty bowl and fill it after security, or use a bottled water dispenser at the airport. Some pet-friendly airports have water bowls past security.
Pet medications: Medications in original labeled containers are exempt from liquid restrictions. Insulin, heart medications, thyroid pills, and seizure medications for pets have no size limit in carry-on. Declare them to TSA if questioned.
Pet supplements and vitamins: Dry supplements are allowed without limit. Liquid supplements follow the 3-1-1 rule.
Tip: If you're traveling with a pet that requires refrigeration (insulin, medications), notify TSA at security. They will work with you to keep the item cool through screening. You're also allowed to bring a small soft-sided cooler with ice packs in checked luggage.
International Pet Travel: Documentation
Flying internationally with a pet requires far more documentation than domestic travel. TSA has no control over these rules—they're set by destination countries and the U.S. Department of Agriculture (USDA).
Required for all international pet travel:
- Health certificate: Issued by a USDA-licensed veterinarian within 10 days of travel. Costs $75-150. The certificate confirms your pet is healthy and has vaccinations current.
- Rabies vaccination proof: Most countries require rabies vaccination. Must be administered by a licensed veterinarian and documented.
- Microchip: Many countries (EU, UK, Canada) require a microchip with a number registered in an international database.
- Import permit: Your destination country may require an import permit applied for 4-8 weeks in advance. Japan, Australia, UK, and New Zealand have strict import rules.
- Airline-specific requirements: Some airlines require additional health forms or transportation crates.
Country-specific rules:
EU/UK: Pet passports required, 21-day quarantine after first rabies vaccination, microchip registered with national database, AHC (Animal Health Certificate) issued within 10 days of travel.
Canada: Health certificate within 30 days of travel, rabies vaccination proof, import permit not typically required, but some provinces have restrictions.
Australia: One of the strictest. Import permit required 4 months in advance, quarantine up to 30 days, blood tests for rabies antibodies, microchip registration mandatory.
Mexico: Health certificate, rabies vaccination, no import permit required, relatively permissive.
Japan: Health certificate, rabies vaccination proof, microchip, import permit required, quarantine up to 30 days.
Planning timeline: For international pet travel, plan 2-3 months in advance. Contact the destination country's embassy website or a pet relocation service for current requirements. Quarantine rules change frequently, and missing a single requirement can result in your pet being returned on the next flight.
Warning: Some destinations have breed restrictions for imports. Pit bulls and certain breeds are prohibited entry in the UK, Australia, and some EU countries. Check breed restrictions before booking your flight.
Airline-Specific Pet Policies 2026
| Airline | Carry-On Pet Fee | Cargo Breed Bans | ESA Policy |
|---|---|---|---|
| Southwest | $95 (one per flight) | None | Requires ESA letter, one per passenger |
| Delta | $110 | Pit bulls, Akitas, Huskies, Chows, wolf hybrids | Requires ESA letter, $110 fee applies |
| United | $125 | Pit bulls, Akitas, Rottweilers, Dalmatians, Huskies | Requires ESA letter, $125 fee applies |
| American | $100 | Pit bulls, Akitas, Rottweilers, Dalmatians | Requires ESA letter, $100 fee applies |
| JetBlue | $125 | Pit bulls, Akitas, Staffordshire Terriers | No in-cabin pets; cargo only with restrictions |
Airlines update pet policies frequently. Call ahead if you have questions about specific restrictions or breeds.
Brachycephalic (Flat-Faced) Dogs: Airline Restrictions
Many airlines restrict travel of brachycephalic dogs (bulldogs, pugs, Shih Tzus, Boston Terriers) because they are susceptible to heat stroke and respiratory distress. Restrictions vary by airline and season.
- Delta: Brachycephalic dogs allowed in cabin but not in cargo during warm months (May-September)
- United: Brachycephalic dogs banned in cargo year-round; cabin travel allowed with airline approval
- American: Brachycephalic dogs allowed in cabin only; no cargo travel
If you have a brachycephalic dog, book well in advance and notify the airline immediately. Some flights may be fully booked for pets before cabin availability opens to you.
Pet Relocation Services and Professional Handlers
For complex international moves or if your pet is aggressive or anxious, professional pet relocation services exist ($2,000-5,000). These companies handle all documentation, vaccination schedules, quarantine arrangements, and ground transport in both countries. They're worth the cost if you're relocating permanently or have a high-value animal.
Final Pre-Flight Checklist
- Confirm carrier dimensions fit airline specifications for your specific aircraft
- For ESAs, have a properly dated letter from a licensed mental health provider (within one year)
- Pack pet medications in original labeled containers
- Bring an empty water bowl or collapsible bowl; fill after security
- For international travel, obtain health certificate within 10 days of departure
- Verify airline breed restrictions and brachycephalic dog policies
- Call your airline 48 hours before departure to confirm pet reservation
- Arrive early to allow time for security screening with your pet
FAQ: Flying with Pets
Will my pet go through the X-ray machine?
No. Your pet passes through security screening with you, but they do not go through the X-ray machine. You carry your animal through the metal detector. The empty carrier goes through the X-ray.
Can I leave my pet unattended at security?
No. Your pet must stay with you at all times. If you need to remove your pet from its carrier at security, keep the animal in visual contact and physical control at all times.
What if my pet is anxious about flying?
Consult your veterinarian before your flight. Some vets recommend anti-anxiety medication for nervous pets. Arrive early to allow your pet to acclimate. Some airports have pet relief areas post-security where you can give your animal a bathroom break before boarding.
Are service dogs allowed without documentation?
Service dogs are legally allowed in-cabin without documentation under the Air Carrier Access Act. However, airlines can ask for proof of task-specific training. A simple letter from your handler or trainer is sufficient.
What happens if my pet is denied boarding?
If an airline denies your pet boarding (aggressive behavior, fake ESA letter, breed ban), the airline is not obligated to provide a refund. You would need to rebook with a different airline or make other travel arrangements. Check policies before purchasing.