No dog or pet shall be allowed to run at large in any public park. Any dog or pet shall be deemed to be found running at large, unless the owner carries such dog or pet or leads such dog or pet by a chain, strap, or rope not exceeding six feet in length, or keeps any such dog or pet confined in an automobile. However, any dog or pet especially trained to assist a blind or partially blind person and accompanying such person shall not be deemed to be running at large, even though restraints as described herein are not used. Such person shall keep the guide dog under control and shall be liable for any damage done to the premises or facilities by the dog or pet. The Chief of Police shall remove and impound any dog or pet running at large in any public park.