California Code, Health and Safety Code - HSC § 111970

No live animal or fowl shall be kept or allowed in any establishment where food is prepared, manufactured, kept, stored, offered for sale or sold unless the establishment is exclusively devoted to the slaughter, processing and/or sale of the animal or fowl. This section does not apply to dogs used by uniformed employees of private patrol operators and operators of a private patrol service who are licensed pursuant to Chapter 11.5 (commencing with Section 7580) of Division 3 of the Business and Professions Code, while those employees are acting within the course and scope of their employment as private patrolmen.

The state department may adopt regulations as it determines are reasonably necessary under this section for the protection of the public health and safety.