Cal. Pen. Code § 337h
Any person who, except for medicinal purposes, administers any poison, drug, medicine, or other noxious substance, to any horse, stud, mule, ass, mare, horned cattle, neat cattle, gelding, colt, filly, dog, animals, or other livestock, entered or about to be entered in any race or upon any race course, or entered or about to be entered at or with any agricultural park, or association, race course, or corporation, or other exhibition for competition for prize, reward, purse, premium, stake, sweepstakes, or other reward, or who exposes any poison, drug, medicine, or noxious substance, with intent that it shall be taken, inhaled, swallowed, or otherwise received by any of these animals or other livestock, with intent to impede or affect its speed, endurance, sense, health, physical condition, or other character or quality, or who causes to be taken by or placed upon or in the body of any of these animals or other livestock, entered or about to be entered in any race or competition described in this section any sponge, wood, or foreign substance of any kind, with intent to impede or affect its speed, endurance, sense, health, or physical condition, is guilty of a misdemeanor.
Ca. Pen. Code § 337h