Directory: Techniques → Offensive Techniques → Physical techniques
Mad Dog Fist (狂拳, lit. "Crazy Fist") is a technique used by Goku in reaction to Jackie Chun's (Master Roshi's alter-ego) use of the Drunken Fist during the 21st World Martial Arts Tournament. In the Dragon Ball manga, Goku uses the Mad Dog Fist and the Crazy Monkey Technique one after the other, while in the anime, he only uses the Crazy Monkey Technique (猿拳, Saru-ken).
Pretending to be a wild uncontrollable dog or monkey, Goku catches his opponent off guard eventually knocking him out with a swift kick by jumping from behind. Goku mistakenly calls this technique Kyo-ken in the manga, which Jackie Chun yells at him "You've got your Martial Arts words wrong! Kyo-ken means MAD DOG!".