I think I (as Mayor!) will interview everyone who wants to move in, and I'll have several animal helpers that will help me gauge their reactions.

But a charter of sorts is a good idea - maybe we should spilt it between rules for animals, and rules for people!
Like for people: You must love all animals, or at least be respectful of those you don't.

For pets: All pets are created equal - a 200-pound St. Bernard has no greater rights in any situation than an 8-ounce canary.