Second largest city in the country.OK - Unless you have other data, my guess is that the per-capita dog numbers in shelters are similar in CA and the rest of the country. WY may be an exception. Some of the colder states may be an exception. There are many cities around the country that have done this (CA is just the first state to do it).
If this law was about 'puppy mills' rather than breeders in general, why are cats and rabbits included. This is about animal activism disguised in a law against 'puppy mills'. It is a law against pet shops in general. The law will not hurt puppy mills it will hurt pet shops.
Tenth largest economy in the world.
The skanky pet shop in east la cannot buy animals from their nighbors house. How many pet stores do you think there are in the second largest city in the country, not to mention Orange County alone and the greater los angles basin.
I don't think you understand the scale of the problem.
We haven't even included San Diego county and the Bay Area.