A System and Method for Tracking Animals Using Bar Coding providing an infrared readable tag containing a bar code to identify and provide medical and other information about an animal. Information-sharing among animal owners, veterinarians, kennel operators, and boarding facilities is achieved by interconnected bar code, personal digital assistant, computer database, central processing unit, and Internet, which are used to input, store, download, collect, access, and otherwise use information about an animal. The present invention may be used to assist in locating owners of lost animals and in providing an animal's medical history, especially for emergency treatment.