Microchipping is not federally mandatory across the United States, but requirements vary by location. Some states, cities, or counties have specific regulations that make microchipping obligatory, particularly for pets adopted from shelters or purchased from breeders. However, it is highly recommended for all pet owners as a reliable way to permanently identify pets and increase the chances of reuniting lost animals with their owners. Microchips act as an invisible link to your pet, unlike tags which can be easily removed or lost, offering added security for pet recovery.