Mich. Comp. Laws § 750.61: Docked horses; registration, bringing into state.

Sec. 61.

Importation, etc., of unregistered docked horses-It shall be unlawful for any person or persons to import or bring into this state any docked horse or horses, or to drive, work, use, race or deal in any docked horse or horses within this state, unless the same shall be registered as provided for in the succeeding section of this chapter.