Yes, a law change like that, animals rights groups at least try to get the grandfather clause in, as Candace has mentioned. Don't assume that is in there, though.

We have antihoarding laws, which limit cats, dogs. It varies by city and town, it isnot a state rule. So in my city, max 3 dogs, no limit on cats. City next door: max 3 dogs, 5 cats. Over on the other side: no limits on either dogs or cats.

Because in some cities (not mine) they are anti hoarding laws, it does NOT matter if the animals are well cared for, see the vet regularly etc. If you have too many, Animal Control can make you get rid of them.