If you own more than one dog, you gotta go with a group costume. Suit up your pooches as the starting lineup on your favorite sports team. Love sci-fi? Deck them out as the Justice League superheroes (or perhaps the Legion of Doom). Go the good versus evil route and dress your pit bull as a devil and your bichon frise as a little angel. If your pooch is a singleton, round up some canine companions and take a band of pirate dogs for a Halloween plunder of the 'hood.