In this comedy, Charlie Chaplin has a companion--a pet bulldog. Walking along a street with his bulldog, Charlie finds a "good luck" horseshoe just as he passes the training camp of an enormous fighter named Spike Dugan. Outside the camp is a large, painted advertisement which states Dugan is seeking sparring partners "who can take a punch." After watching other better fighters be soundly beaten by Dugan, Charlie decides his best bet is to put the horseshoe inside his boxing glove. Using the loaded glove, Charlie connects with a solid punch and wins. The trainer prepares Charlie to fight the world champion. A gambler wants Charlie to throw the fight. He and the trainer's daughter fall in love.