63 Moby Thesaurus words for "mad dog": Mafioso, Young Turk, beast, beldam, berserk, berserker, bomber, bravo, brute, bucko, bully, bullyboy, cutthroat, demon, desperado, devil, dragon, fiend, fire-eater, firebrand, fury, goon, gorilla, gunman, gunsel, hardnose, hell-raiser, hellcat, hellhound, hellion, holy terror, hood, hoodlum, hothead, hotspur, incendiary, killer, madcap, monster, mugger, rapist, revolutionary, rough, rowdy, ruffian, savage, she-wolf, spitfire, termagant, terror, terrorist, thug, tiger, tigress, tough, tough guy, ugly customer, violent, virago, vixen, wild beast, witch, wolf

Source: Moby Thesaurus II by Grady Ward, 1.0