Mister is a very large tailless tomcat that Harry rescued about three years before 'Storm Front'. He was found in a garbage as a kitten after a dog (or car) had torn off his tail. He's larger then a fair amount of dogs, about thirty pounds all in all. He comes and goes as he likes from Harry's apartment, but has clear affection for his rescuer (and graces others with his presence when he feels like it). His usual greeting is a strong shoulder shove to your shins. When Mouse moved in he basically ignored him or treated him as 'the dumb dog'. Gradually they formed a sort of truce and respect for each other.