Farina, Joe, and friends use dogs to power their "roadsters," but following a lesson from the head of the Be Kind to Animals Society, they make it their cause to rescue animals from bad treatment. Joe even manages to find patience for a nagging flea that persists in biting him. Meanwhile, Wheezer, who has been tormenting animals with his games, dreams that the animals have turned the tables on him.
The Rascals have a boxing arena that could pack them in if they could find fighters who would actually mix it up. Harry and Farina notice a rivalry between two very large young kids, Joe and Chubby, that would fill the bill if only the two heavyweights would put aside their gentle natures. Farina gets an idea: tell each of the lads that the other will take a dive in the second round. So the fight begins and the stands are filled; but will the combatants actually throw a punch? Ernie has one more trick up his sleeve to get the fists flying and the crowd on its feet. Sweet science indeed.
With Wheezer's new baby brother getting all the attention, he tries to send the baby back.