Cal. Food & Agric. Code § 32001

(a) All public animal shelters shelters operated by societies for the prevention of cruelty to animals, and humane shelters, that contract to perform public animal control services, shall provide the owners of lost animals and those who find lost animals with all of the following:
1. (1) Ability to list the animals they have lost or found on “Lost and Found” lists maintained by the animal shelter.
2. (2) Referrals to animals listed that may be the animals the owners or finders have lost or found.
3. (3) The telephone numbers and addresses of other animal shelters in the same vicinity.
4. (4) Advice as to means of publishing and disseminating information regarding lost animals.
5. (5) The telephone numbers and addresses of volunteer groups that may be of assistance in locating lost animals.
(b) The duties imposed by this section are mandatory duties for public entities for all purposes of the Government Code and for all private entities with which a public entity has contracted to perform those duties.