Any person who owns, keeps, harbors or cares for a dog is subject to a notice of violation and penalty or the impoundment of the dog, or both, if the dog is permitted to be at-large. A dog will be considered at-large in the following instances:
(A) Any dog that is off the property of the owner, or the person keeping or harboring such dog(s), unless such dog(s) shall be under control by leash, cord, chain or other similar device.
(B) Any dog that is upon any school premises or grounds or upon any public recreation area when an organized activity is being conducted unless the dog is controlled by a leash or similar device.
(C) Any dog, whether on leash or not, which shall be or which shall enter upon any church premises, any public meeting, or gathering place, restaurants, food markets, eating establishments, department and dry goods stores and rest rooms open to the public during the time that said place is open for business; provided, however, these provisions shall not apply to dogs leading visually handicapped persons.
(D) Any dog of fierce, dangerous, or vicious propensity off the property of the owner or the person keeping or harboring said dog unless the dog is wearing a muzzle of sufficient strength to prevent its biting any person or another animal. Said muzzle shall be worn even though the dog is controlled by a leash, at "heel" beside a competent person and obedient to that person's command, under the immediate control of a competent person or otherwise humanely restrained.
('86 Code, § 3.104)