The U.S. Centers for Disease Control and Prevention (CDC) is implementing new border rules for dogs entering the United States as of Aug. 1. However, the new rules going into effect are not as onerous as the ones originally planned. The U.S. Centers for Disease Control and Prevention (CDC) is implementing new border rules for dogs entering the United States as of Aug. 1. However, the new rules going into effect are not as onerous as the ones originally planned. Veterinary medicine Phys.org – latest science and technology news stories