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When an encyclopedia salesman convinces Blondie Bumstead that her son, Baby Dumpling, is a certified genius, she rushes to enroll her little prodigy in school. Blondie's motherly concern causes the other kids to taunt Baby Dumpling, and he returns home with a black eye, vowing never to let his mother walk him to school again. Meanwhile, Blondie's husband Dagwood has his own problems at his office when Cartwright, one of his company's clients, refuses to pay for the building that Dagwood has just built for him. Cartwright's chicanery causes Dithers to fire Dagwood once again. The next morning, Dagwood, afraid to tell Blondie that he has been fired, leaves for the office, while family dog Daisy accompanies Baby Dumpling to school. While waiting for her master, Daisy is arrested by the dog catcher, and the next day, Baby Dumpling plays hooky from school to search for his lost dog. When the school principal notifies Blondie of her son's absence, she rushes frantically to the police station, where she meets Dagwood, who has been arrested for slugging Cartwright. Meanwhile, Baby Dumpling finds Daisy at the home of Melinda Mason, a rich crippled girl whose nurse bought the dog at the pound. Befriending Melinda, Baby Dumpling takes her to see his swing, and when Mr. Mason discovers that his daughter is missing, he also goes to the police station and there meets the Bumsteads. Dagwood then returns to the Mason home to look for Baby Dumpling, but the gardner mistakes him for a kidnapper and locks him in the shed. As the police surround the shed, Dagwood surrenders, and later they all converge at the Bumstead house, where they find Melinda walking and playing with Baby Dumpling. Grateful that his daughter is now walking, Mr. Mason buys Dagwood's building to use as a children's home and all ends happily.