San Francisco Health Code
SEC. 41.12. DUTIES OF OWNERS OR GUARDIANS.
(a) It shall be unlawful for the owner or guardian of any animal, other than a domestic cat, to permit said animal to run at large within the City and County; provided, however, that the provisions of this subsection shall not be applicable to any area under the jurisdiction of the Recreation and Park Commission of the City and County, and which has been designated by said Commission as an animal exercise area.
1. It shall be unlawful for the owner or guardian of any animal to permit said animal to be within an area designated as an animal exercise area unless said owner or guardian is physically present at all times during which the animal is within said area.