Food and Agricultural Code § 31641

All potentially dangerous dogs shall be properly licensed and vaccinated. The licensing authority shall include the potentially dangerous designation in the registration records of the dog, either after the owner or keeper of the dog has agreed to the designation or the court or hearing entity has determined the designation applies to the dog. The city or county may charge a potentially dangerous dog fee in addition to the regular licensing fee to provide for the increased costs of maintaining the records of the dog.