Following the events of "Arthur's Pet Business," Arthur is trying to train his new puppy, Pal, to behave, but Pal ends up making huge messes and causing disturbances around the house. Arthur wants Moon Boots and tries to get money to buy them. While Arthur is cleaning the garage, his neighbor, Mrs. Tibble comes by and, mistaking it for a yard sale, offers to buy a necklace for the amount of money he needs for his Moon Boots. Arthur regrets this decision when he learns that the necklace is a present for his mother's birthday, so he tries to earn it back.