It's the world of cats and dogs. Blackie, a little black kitten (who lost his mittens), dreams that he runs off to join a school for criminals. Tiring of "sissy stuff," he gets his wish when he teams up with Fagin and his school for young crooks. Blackie gets mixed up with some bad cats. There's a shootout with police dogs. The scenario is a perfect excuse for the "Three Little Kittens" song.