Recently legislation was introduced in Michigan which would have eventually made owning a pit bull in Michigan illegal.  That bill has stalled, but Monday Saginaw passed a "dangerous dog" law. reports:

The City Council Monday passed the contentious "dangerous dogs" ordinance after a year of debate, which requires owners of designated breeds -‑ pit bulls, presa canario, bull mastiffs, rottweilers and German shepherds -- to register their pets at the City Clerk's office for $20, post a sign in the front of their homes stating "Dog on premises" and keep their animals either on a leash or within a 4-foot pen.

The law does not ban pit bulls as the proposed state law would.  There are some big questions about the law.  Is it fair to dog owners?  Is it enforceable?