Moving a pet from Puerto Rico to the mainland United States looks like it should be the easiest trip in this series, and on paper it is. Puerto Rico is a US territory, so a flight from San Juan to Miami or Orlando is domestic travel. There is no CDC Dog Import Form, no customs process for the animal and no USDA endorsement. The real difficulties are practical: a lot of conflicting advice online about which Puerto Rico rules apply when you leave, airlines that take small pets in the cabin but very few options for large dogs, and a tropical climate that keeps running into airline heat limits for animals in the hold.
This guide is part of our inbound series led by the Europe to the US hub. If you are moving the other way, see our guide to moving a pet to Puerto Rico.
Domestic travel: what that actually means for your pet
Because Puerto Rico is part of the US, pets moving between the island and the mainland are not imports. The CDC dog import rules do not apply, and USDA does not get involved in the paperwork. The USDA APHIS pet travel FAQ is explicit that it does not endorse health certificates for pets moving across state or territorial lines, and that the destination state or territory sets the requirements. So for a move from San Juan to the mainland, two sets of rules matter: your destination state's rules for dogs and cats arriving from elsewhere, and your airline's rules for carrying the animal.
The 72-hour rule: it is for arriving in Puerto Rico, not leaving
Many guides tell owners leaving Puerto Rico that they need a health certificate and parasite treatment within 72 hours. We checked the source. The Puerto Rico Department of Agriculture's regulations for imports into Puerto Rico set the 72-hour requirement for treatment for external parasites before entry into Puerto Rico, alongside an official health certificate valid for 30 days, rabies vaccination within six months for dogs and cats over four months old, and individual identification. Those are entry rules for animals arriving on the island. We did not find a Puerto Rico requirement for a government exit permit or a 72-hour certificate for a pet dog or cat leaving for the mainland. If you are planning a round trip, the 72-hour rule matters on the way back to the island, not on the way out.
What your destination state may require
Mainland states set their own rules for dogs and cats coming in, and they vary. Many expect a certificate of veterinary inspection, often called a health certificate, from an accredited veterinarian, and most require current rabies vaccination for dogs, and often cats, above a minimum age. A few states are stricter, and Hawaii is in a category of its own. Check the state veterinarian's page for your destination before you book. In practice, a recent health certificate from an accredited vet in Puerto Rico, plus the rabies certificate, satisfies most states and most airlines at the same time. Our pet health certificate guide explains what goes on the form.
What your airline will require
Airlines set the rules you will actually be checked against at the counter. For pets flying in the hold or as cargo, carriers generally want a health certificate issued within about 10 days of travel; American Airlines Cargo publishes its documentation rules for animals, for example. For pets in the cabin, requirements vary by carrier, and some ask for health or vaccination records even on domestic routes. Ask the airline directly when you book the pet, and get the answer in writing, because counter staff in San Juan will apply the airline's policy rather than any general guide.
Small pets: the cabin is the easy route
For a cat or small dog that fits under the seat, the move is straightforward. Several airlines that serve San Juan take small pets in the cabin, each with its own carrier dimensions, fees and limits on how many pets can be on one flight. Southwest's pet policy, for example, allows one pet carrier per ticketed customer, with up to two small pets of the same species in that carrier, and limits the number of pet carriers per flight, so book early. Southwest does not carry pets as cargo, which matters for larger animals. Our guides to Southwest and American Airlines cover fees and carrier sizes, and our guide to flying with a dog in the cabin covers the practical side.
Large dogs: the hard part of leaving Puerto Rico
For dogs too big for the cabin, options narrow sharply. Delta and United carry pets as cargo only for military and State Department personnel on orders. American Airlines' PetEmbark cargo program is open to the public and serves San Juan, but it applies temperature limits: American Airlines Cargo will not move animals when temperatures anywhere on the route are above 85F. San Juan sits above that threshold for long stretches of the day for much of the year, and the main arrival cities, Miami, Orlando, Fort Lauderdale, Dallas and Houston, are hot in summer too. There is no passenger ferry or road link to the mainland, so the realistic large-dog options are an early-morning or late-evening cargo flight in the cooler months, a specialist pet shipper who books cargo and handles the timing, or a private charter for families who can absorb the cost.
| Pet | Realistic option | Main constraint | Paperwork to carry |
|---|---|---|---|
| Cat or small dog | Cabin on a carrier serving San Juan | Limited pet carriers per flight, one carrier per passenger | Airline requirements, rabies record, destination state rules |
| Medium or large dog | American Airlines PetEmbark cargo or a pet shipper | 85F temperature limit, seasonal embargoes | Health certificate within about 10 days, rabies certificate |
| Snub-nosed breed | Cabin only if small enough | Most carriers restrict these breeds in the hold | As above |
| Military or State Department family | Delta or United cargo on orders | Orders required | Orders plus health and rabies records |
Timing around the heat
If your dog must fly in the hold, the time of year and time of day decide whether the flight happens. The winter months, roughly December to March, give the widest window on both ends. Early-morning departures from San Juan are usually the coolest option, though arrival-city temperatures count too. Have a backup date, because cargo bookings for animals can be cancelled on the day if the forecast crosses the limit. Build that flexibility into your housing and work plans rather than booking the dog on the last possible day before a lease ends.
Satos, rescues and adopting on the island
Puerto Rico's street dogs, known locally as satos, are adopted by mainland families in large numbers, and several rescue groups fly dogs to partner shelters on the mainland, often with volunteer passengers or in group cargo shipments. Because this is domestic travel, there is no CDC import process, but the airline and destination state rules still apply, and rescues typically handle vaccinations and health certificates before the flight. If you adopted a sato yourself while living on the island, the same rules apply to you as to any other dog leaving Puerto Rico.
Rabies and vaccination records
Rabies is present in Puerto Rico's mongoose population, and dogs on the island can be exposed, which is one reason mainland states and airlines pay attention to rabies vaccination. Keep the rabies certificate with the dog's microchip number on it, and make sure the vaccination is current on travel day rather than due the week after you land. Some states ask for proof of vaccination for cats as well, so carry records for every animal.
A dog that originally came to Puerto Rico from abroad
If your dog first arrived in Puerto Rico from another country, it already went through US entry when it landed on the island, and the onward trip to the mainland is domestic. The exception runs the other way: the CDC notes in its dog importation FAQ that there are no registered animal care facilities in US territories, so a foreign-vaccinated dog from a high-risk country cannot enter the US through Puerto Rico in the first place. If you are moving a dog from a third country through San Juan, it must meet US entry rules at an approved mainland airport instead.
Preparing a dog that has never flown
Many island dogs have never been in a crate or a car for long, let alone an aircraft. Start crate training several weeks before the move with the actual travel crate, feeding meals inside it and building up to an hour or two with the door closed. Short car rides in the crate help the dog connect it with ordinary trips rather than stress. On travel day, offer a light meal several hours before departure, a walk just before check-in, and familiar bedding in the crate. Do not sedate a dog for air travel unless your vet specifically advises it, since sedation affects breathing and balance at altitude and many carriers refuse visibly sedated animals.
Several pets and a household move at the same time
Families leaving Puerto Rico often move everything at once: a car on a roll-on roll-off ship, household goods in a container and the pets by air. Shipping lines and household movers will not carry live animals, so the pet plan runs separately and usually on a different date from the furniture. With two or more pets, the one-carrier-per-passenger cabin rule means you may need every adult in the family flying on the same day, or one pet in the cabin and another as cargo. Book all of the animals at the same time and confirm each booking in writing.
When a pet shipper is worth it
For a cat or small dog flying in the cabin with you, a shipper is rarely necessary. For a large dog, a snub-nosed breed, a summer move or several animals, a shipper based in Puerto Rico earns its fee by knowing which flights actually operate within the temperature limits, supplying a compliant crate, booking cargo space and arranging collection on the mainland. Ask for an itemized quote and a clear policy on what happens if the airline cancels the animal's booking because of heat.
The US Virgin Islands and other territories
The same logic applies to the US Virgin Islands and other US territories: travel to the mainland is domestic, USDA does not endorse the paperwork, and the destination state and the airline set the rules. Flight options for pets from St. Thomas and St. Croix are thinner than from San Juan, so many owners connect through San Juan or Miami, which adds a connection to the plan and a second airport's temperature conditions to the cargo calculation.
The last leg on the mainland
Most flights from San Juan land in Florida, the Northeast or Texas. If your new home is far from those gateways, remember that once on the mainland, few airlines carry pets in the hold for the general public, so a large dog may finish the trip by road. A ground pet transporter from Miami or Orlando is the usual answer for families moving to the Midwest or West. Booking that leg before you fly avoids a scramble on arrival.
What it typically costs
A small pet in the cabin costs the airline's pet fee, often in the low hundreds of dollars each way, plus a vet visit for records. A large dog flying cargo costs more, with the fee driven by crate size and route, plus an IATA-compliant crate and the health certificate. A full-service pet shipper or a charter sits at the top of the range. Get quotes early, especially for summer moves, when capacity for animals is tightest.
A short checklist
- Check your destination state's entry rules for dogs and cats.
- Ask your airline exactly what documents it needs, and when they must be dated.
- Book the pet with the airline before or with your own ticket.
- For a large dog, plan around the temperature limits and keep a backup date.
- Get a health certificate from an accredited vet inside the airline's window, and carry the rabies certificate.
- Plan the last leg from your arrival airport to your new home.