"Vicious animal" means any dog or other animal, except a dog assisting a peace officer in law enforcement duties, which has attacked any person or other animal, without provocation by such person or other animal, at a place other than on private property where the attacking animal is maintained by its owner, or at any place within the city limits, unless the attack occurs within an enclosed yard where the animal is maintained by or on behalf of its owner.
(County code § 6-1.313; Ord. 89-14 § 7)