Mich. Comp. Laws § 287.391: Bill of sale; form.

Sec. 11.

The purchase of any dog or cat by the licensee or research facility shall be evidenced by a bill of sale signed by the seller. The bill of sale shall be a form approved by the director of agriculture and shall certify that the seller is the lawful owner of the dog or cat and that ownership is transferred to the licensee or research facility.