CDC issues regulations to control the entry of dogs into the United States from other countries. These rules apply to all dogs, including puppies, service animals, and dogs that left the United States and are returning. They also apply whether you are a U.S. citizen, legal U.S. resident, or foreign national.
Starting on August 1, all dogs entering the U.S. (including those that left the U.S. and are returning, and regardless of the country they are coming from) must be:
• Healthy upon arrival
• At least 6 months of age
• Microchipped
• Accompanied by a CDC Dog Import Form receipt and required vaccination and veterinary documents.
Additional requirements may apply depending on where the dog has been in the last 6 months and whether or not the dog was vaccinated in the United States.
Use CDC's Q&A tool (the CDC "DogBot") to determine what rules apply to your dog: https://www.cdc.gov/importation/bringing-an-animal-into-the-united-states/dogs.html