Ala. Code § 3-7A-4: Issuance of Tag.

Coincident with the issuance of the certificate of immunization, the rabies officer, his authorized representative, or any duly licensed veterinarian, who provided the certificate shall furnish a serially numbered tag bearing the same number and year as that of the certificate, which tag shall at all times be attached to a collar or harness worn by the dog or cat for which the certificate and tag have been issued.