According to the text, dogs are not allowed to enter the United States without a valid rabies vaccination and microchip record. Puppies may enter the US if they have a health certificate and seem healthy, but certain rules vary depending on their intended use. Dogs that have been in high-risk countries are subject to inspection upon arrival, while those coming from non-high-rabies countries do not require a vaccination and microchip record. However, it is still recommended. Cats and dogs may be taken to the border without a health certificate, but will be inspected upon arrival. The United States does not require a microchip unless the dog is coming from a high-risk rabies country. Planning ahead is important to ensure your dog clears the border and there are no exceptions for any dogs entering the US.