I was wondering the same thing and found this on www.topuertorico.org
My Fiance, myself and our 4 year old Papillon are planning on moving within the year.Further info is appreciated!
Traveling with Pets
Before taking a flight with your animal, have your veterinarian examine your pet to ensure that it is healthy enough to make the trip. Airlines and State health officials generally require health certificates for all animals transported by air. You will be required to: 1) Outfit your pet with a sturdy collar and two identification tags. The tags should have both your permanent address and telephone number and an address and telephone number where you can be reached while traveling. 2) Rabies quarantine certificate from veterinary doctor stating that pet has had a rabies shot. For more information contact the U.S. Department of Agriculture Puerto Rico office, Veterinary Division at (787) 766-6050.