Wisconsin Statutes Fences (Ch. 90) § 90.04. Effect of fences on action for trespass by animals

Owners of lands who do not maintain and keep in repair lawful partition fences may not recover any damages for trespasses by the animals of owners of any adjoining lands with whom partition fences might have been maintained if such lands had been enclosed; but the construction of such a fence does not relieve the owner of swine, horses, sheep or goats from liability for any damage they commit upon the enclosed premises of an adjoining owner.