Cal. Pen. Code § 597r
Any person or persons violating any of the provisions of this act, shall be deemed guilty of a misdemeanor; provided, however, that the provisions of Sections 597n, 597p, and 597q, shall not be applied to persons owning or possessing any docked purebred stallions and mares imported from foreign countries for breeding or exhibition purposes only, as provided by an act of Congress entitled "An act regulating the importation of breeding animals" and approved March 3, 1903, and to docked native-bred stallions and mares brought into this State and used for breeding or exhibition purposes only; and provided further, that a description of each such animal so brought into the State, together with the date of importation and name and address of importer, be filed with the county clerk of the county where such animal is kept, within 30 days after the importation of such animal.
Ca. Pen. Code § 597r