Mich. Comp. Laws § 433.55

Sec. 5. In case the animal so seized under the foregoing provisions of this act shall have been so running at large by the willful act of any other person than the owner, such person shall be liable to the owner in a penalty not less than 25 dollars and not more than 100 dollars, which penalty may be recovered by such owner for his benefit, in an action on the case in any court of competent jurisdiction.