is the Dog Star, infamous for his fiery temper. The main character of Dogsbody
, he is sent to Earth in the form of a dog as punishment for a crime he claimed he didn't commit. On Earth, he must find a certain object during his life as a dog if he wants to return to the stars.
He is adopted by girl named Kathleen, who names him Leo. He is also referred to as "Shamus", "Shamus O'Cat", "Shamus Rat", "Rat", "Dog", and "That Creature".