If the owner of an animal taken up under s. 172.02 is unknown, the finder shall, within 10 days after taking up the animal, file a notice with the clerk of the town in which the animal is taken up and, if the value of the animal exceeds $50, shall publish in the county a class 3 notice, under ch. 985. The notice shall briefly describe the animal, by marks natural or artificial, as near as practicable, and give the name and residence of the finder and the time when the animal was taken up. A copy of the notice shall be sent immediately by the town clerk to the county clerk, who shall file the notice.