In the park, a child named Tangguo chased, beat, and scolded a little dog named Chuichui. Although Chuichui was her own family's dog, Tangguo did not like it. During the chase, Tangguo got tired of running, pulled a ham sausage out of her pocket, and started eating it. At this moment, a big fierce dog appeared in the park, saw the meat sausage in Tangguo's hand, rushed forward, and knocked Tangguo down. Just as the fierce dog was about to bite and maul Tangguo, the little dog Chuichui saw that its little master was in danger and chose to step forward bravely to fight the fierce dog and save its little master.