Cal. Bus. & Prof. Code § 4858.1
(b) Continuing education hours for veterinarians shall be earned as follows:
(1) Attending courses relevant to veterinary medicine and sponsored or cosponsored by any of the following:
(2) A total of 6 hours or fewer of the required 36 hours of continuing education may be earned by doing either of the following, or a combination thereof:
(B) Up to four hours may be earned by providing pro bono spaying or neutering services for a public animal control agency or shelter, society for the prevention of cruelty to animals shelter, humane society shelter, or rescue group in compliance with the following:
(e)