Wyo. Stat. § 11-25-203: Horses to race under true name; substitution of horses, concealment of identification, prohibited.

Every horse participating in any event authorized by a permit issued under this act shall participate under its true and registered name, shall be fully and truly identified and shall not participate under any other name or identification. There shall be no substitution of horses nor shall any device whatsoever be used to conceal or confuse the name and identification of any horse.