7 U.S.C. § 2141 : US Code - Section 2141: Marking and identification of animals

Search 7 U.S.C. § 2141 : US Code - Section 2141: Marking and identification of animals

All animals delivered for transportation, transported, purchased,
or sold, in commerce, by a dealer or exhibitor shall be marked or
identified at such time and in such humane manner as the Secretary
may prescribe: Provided, That only live dogs and cats need be so
marked or identified by a research facility.