What official identification tag requirement is essential for tracking ownership changes?

The requirement that tags must include a unique official ID number is essential for tracking ownership changes because it allows for the precise identification of each individual animal throughout its life. This unique identifier helps maintain accurate records of ownership, health history, and any other relevant data that may change as the animal moves from one owner to another. With a unique official ID number, authorities can quickly verify the identity and history of the animal, which is crucial for effective management in various contexts, such as veterinary care, transportation, or ownership transfers. The distinctiveness of this ID number minimizes the risk of confusion, theft, or errors that can arise when animals are not clearly and uniquely identifiable.