USDA APHIS Veterinary Services (VS) has animal health requirements related to bringing (importing) a pet dog to the United States (U.S.) from a foreign country. If you are bringing dogs in for the purpose of resale, such as commercial sale or adoption as pets, USDA APHIS Animal Care has separate requirements.
Collies, shepherds, and other dogs to be used in the handling of livestock and that are imported from any part of the world except Canada, Mexico, and regions of Central America and the West Indies may be inspected and quarantined at the port of entry to determine their freedom from tapeworm infection.
VS has additional requirements for dogs traveling (imported) to the U.S. from countries affected by specific diseases:(click on blue bars to expand)
When available, you will find additional information about bringing a dog into a particular state on that state's Department of Agriculture website. If information about traveling with a dog is not found on this site, you should contact the State Department of Agriculture or the State Veterinarian’s Office in your destination state directly to determine if there are any import requirements.
Airlines may have separate and additional requirements. Check with your airline to determine what requirements they may have, if any.