I live in Elkhorn, Wisconsin, which is way south of where you want to be in Port Washington. Elkhorn has a three dog limit. Burlington, which is 8 miles from us has no limit, so every town is different.
You might want to contact someone with RGA - Retired Greyhound Athletes.org. They are located just north of Port Washington, and I am sure they will have answers for you. Gpawisconsin.org is also a good site. They do statewide adoptions.
Good luck.