This art film is a puppet animation. As a servant, the black dog has always been loyal while guarding the house for its master, thus earning the master's favor. One day, the master brings home a strange thing—a hen that can lay eggs. The black dog's first impression of it is very poor, but because the master likes it, the dog can only pretend to like it too. When the black dog feels that the hen's status in the master's heart is gradually surpassing its own, it begins to feel deeply unsettled. Upon realizing that the master's affection for the hen stems from its ability to lay eggs, the black dog wishes it could become a dog that lays eggs, but that is impossible. Determined to reclaim the master's love, the black dog devises a clever plan to drive the hen away.