Lex Luthor, Doomsday, and Parasite better watch out, because when your dog is wearing the Pet Big Dogs Superman Costume this year, they're certainly going to be in a lot of trouble Turn your pup into Superdog this year with this incredible Superman dog costume. Featuring a cute blue Superman shirt along with a detachable red cape, your furry friend will be flying in the sky and taking down villains before you can even say "Fetch."