Wis. Stat. § 172.02

Any person finding any animal described in s. 172.01 running at large may take it up, but shall within 7 days after taking up the animal notify the owner, if known to the person, and request the owner to pay all reasonable charges for the animal’s keeping, together with the forfeiture required under s. 172.01 for taking up, and take the animal away within 5 days after being so notified.