California Code, Civil Code - CIV § 1670.10

(b) A contract entered into on or after January 1, 2018, for the lease of a dog or cat that provides for or offers the option of transferring ownership of the dog or cat at the end of the lease term is void as against public policy.

(c) In addition to any other remedies provided by law, the consumer taking possession of a dog or cat transferred under a contract described in paragraph (1) of subdivision (a) or in subdivision (b) shall be deemed the owner of the dog or cat and shall also be entitled to the return of all amounts the consumer paid under the contract.