California Code, Health and Safety Code - HSC § 122330

(a) Uncontrolled and irresponsible breeding of animals contributes to pet overpopulation, inhumane treatment of animals, mass euthanasia at local shelters, and escalating costs for animal care and control; this irresponsible breeding also contributes to the production of defective animals that present a public safety risk.

(b) Though no specific breed of dog is inherently dangerous or vicious, the growing pet overpopulation and lack of regulation of animal breeding practices necessitates a repeal of the ban on breed-specific solutions and a more immediate alternative to existing laws.

(c) It is therefore the intent of the Legislature in enacting this chapter to permit cities and counties to take appropriate action aimed at eliminating uncontrolled and irresponsible breeding of animals