I found this in the April, 2009 Veterinary Practice News.

Spay/Neuter Bill Returns

California state senator Dean Florez, D-Shafter, reintroduced legislation that requires pet owners to have their cats and dogs sterilized. The bill requires that dogs be spayed or neutered unless the owner gets an unaltered dog license. Roaming cats would have to be spayed or neutered.

Julie Mancuso, founder of Social Compassion in Legislation said the bill would cut euthanasia ratios and save taxpayer dollars.

Bill Hemby of PetPAC, a group that helped defeat a similar bill last year said the legislation arrives during financially tough times for the state, making enforcement a challenge.