Dogtown is a shelter for stray dogs, misbehaving dogs, and discarded robot dogs, whose owners have outgrown them. Chance, a real dog, has been in Dogtown since her owners unwittingly left her with irresponsible dog-sitters who skipped town. Metal Head is a robot dog who dreams of being back in a real home. And Mouse is a mouse who has the run of Dogtown, pilfering kibble, and performing clever feats to protect the dogs he loves. When Chance and Metal...