(a) It shall be unlawful for any person owning, keeping or harboring any dog to permit, suffer or allow said dog to run at large within the city. For the purpose of this section, any dog shall be deemed to have been permitted, suffered or allowed by its owner, keeper or harborer to run at large when found outside of the residence structure of the owner, keeper or harborer and not effectively physically restrained on a chain or leash or behind a suitable fence or other proper method of physical restraint from which it cannot escape.
(b) A legally blind person using a “seeing eye dog” or a deaf person using a “hearing dog” in the customary manner under Title II of the Americans With Disabilities Act shall be deemed to be in compliance with division (a).
(c) Official use of dogs by any governmental unit shall be deemed in compliance with division (a).