Mad Dog is the burly but stupid henchman to Bugsy Them in Dog City. He is unable to resist obeying such commands as "sit" and "stay", thanks to spending two (I mean fourteen) years in obedience school. Throughout the show, Mad Dog makes only grunts and squeals. However, when Bugsy proclaims he doesn't even know the meaning of lost when he has nearly been defeated by Ace Yu. Mad Dog proceeded to give definitions of "lost", complete with examples, much to the astonishment of Laughing Boy and Scruffy.