The film is a sequel to Old Yellow Dog and is based on a novel of the same name by Fred Gipson, the author of Old Yellow Dog. The former pet dog has been dead for many years, and the puppy has grown up and is named Sam. In the story, the elder brother Travis, the younger brother Arliss and the girl they grew up with encountered many difficulties, especially when they were captured by indigenous nomads. Loyal Sam wanted to help his master, so he followed. On the other hand, the boys' uncle was also leading the cavalry to the rescue, and after some confrontation, they finally succeeded in defeating the Indians and rescuing the children.