One of my coworkers pointed out this site that lists dumb laws from different states and cities (http://www.dumblaws.com/).
Here are a few dog related ones just from California:
State of California:
Animals are banned from mating publicly within 1,500 feet of a tavern, school, or place of worship.
City Council order reads: “No dog shall be in a public place without its master on a leash.
One may not bring their dog to school. (We actually did this here in our town where it's not against the law - my daughters class was studying Africa, and the teacher thought it would be cool to bring in a real African breed of dog and talk about how they had adapted to their environment!)
One may not take his dog on an elevator with him.
Los Angeles: (less strict than the rest of the state??)
It is a crime for dogs to mate within 500 yards of a church.
One may not allow his or her dog to chase a squirrel in the summer.
It is illegal to have more than two cats or dogs.
One may not raffle off a dog as a gift in any public place.