Cal. Food & Agric. Code § 19356

No meat or meat byproduct or horsemeat or horsemeat byproduct shall be sold or offered for sale as pet food or for pet food purposes by any person under any name or other marking or labeling which is false or misleading, or in any container of a misleading form or size, but established trade names and other marking and labeling and containers which are not false or misleading and which are approved by the director, are permitted.