There IS a law, your municipality simply chooses not to enforce it. Keep making noise - attend meetings, etc. Maybe take it to the press.
The city attorney wrote "The City has discretion whether to take action" as several local, state, and federal gov'ts do not enforce all laws all of the time. He went on to say it was to the city's advantage not to take action due to the costs involved. I have a copy of the letter written to the city, he emphasizes the cost to the city. He charged the city $350 to write this letter. See where I'm going with this. There was a pit bull dog who bit a young child, the child had to be taken to the hospital for stitches in her face. The dog was held for 3 days for testing for rabies and then released. The mother went to the city hall meeting, mayor referred the case to the city attorney for his opinion....another $350. This is a very small town.