CAL. HSC. CODE § 122354 : California Code - Section 122354

(a) The pet store operator or at least one of his or her employees shall be present in the store at least once daily, regardless of whether the store is open, for care and maintenance of the animals in the pet store.

(b) A pet store operator shall comply with the following animal care requirements:

(1) House only compatible animals in the same enclosure.

(2) Observe each animal at regular intervals, at least once a day, in order to recognize and evaluate general symptoms of sickness, injury, or abnormal behavior.

(3) Take reasonable measures to house intact mammals that have reached sexual maturity in a manner to prevent unplanned reproduction.

(4) (A) Maintain and abide by written animal husbandry procedures that address animal care, management and safe handling, disease prevention and control, routine care, preventative care, emergency care, veterinary treatment, euthanasia, and disaster planning, evacuation, and recovery that is applicable to the location of the pet store. These procedures shall be reviewed with employees who provide animal care and shall be present, in writing, either electronically or physically, in the store and made available to all store employees.

(B) Sections 122356 and 122358 do not apply to subparagraph (A) where there are other local, state, or federal laws that apply to those procedures.

(5) (A) If there is a determination that an animal may need to be euthanized, ensure that veterinary treatment is provided without delay.

(B) Notwithstanding subparagraph (A), a rodent or rabbit intended as food for another animal may be destroyed by a pet store operator or an employee of a pet store only if the animal is euthanized by a method that is performed in a humane manner, appropriate for the species, authorized by state law, and in compliance with the American Veterinary Medical Association (AVMA) Guidelines on Euthanasia, dated June 2007, published by the AVMA.

(C) The euthanasia performed pursuant to subparagraph (B) may be performed by a pet store operator or an employee of a pet store only if a California-licensed veterinarian has certified, in writing, that the pet store operator or employee is properly trained and proficient in performing the method of euthanasia on that particular species. The certification shall be valid for a period of not more than three years, and may be recertified for additional periods of three years. Each certification of a pet store operator or employee shall be retained by the pet store for three years, unless a longer period is otherwise required under state law. The certification shall be made available, upon request, to appropriate law enforcement officers exercising authority pursuant to Section 122356.

(D) It is the responsibility of the pet store operator to ensure that euthanasia is performed in compliance with this section.

(E) Subparagraphs (A) to (D), inclusive, shall be implemented in a manner consistent with California law and in accordance with Chapter 11 (commencing with Section 4800) of Division 2 of the Business and Professions Code.

(6) Isolate and not offer for sale those animals that have or are suspected of having a contagious condition. This paragraph shall not apply to those animals that are effectively isolated by their primary enclosure, including, but not limited to, fish, provided that a sign is posted on the enclosure that indicates that these animals are not for sale, or otherwise marked in a manner to prevent their sale to customers during their treatment for the contagious condition.

(7) Have a documented program of routine care, preventative care, emergency care, disease control and prevention, and veterinary treatment and euthanasia, as outlined in paragraph (5), that is established and maintained by the pet store in consultation with a licensed veterinarian employed by the pet store or a California-licensed veterinarian, to ensure adherence to the program with respect to each animal. The program shall also include a documented onsite visit to the pet store premises by a California-licensed veterinarian at least once a year.

(8) Ensure that each diseased, ill, or injured animal is evaluated and treated without delay. If necessary for the humane care and treatment of the animal, the animal shall be provided with veterinary treatment without delay.

(9) In the event of a natural disaster, an emergency evacuation, or other similar occurrence, the humane care and treatment of each animal is provided for, as required by this chapter, to the extent access to the animal is reasonably available.

(c) Subdivisions (a) and (b) shall be implemented to the extent consistent with California law.