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Rin-Tin-Tin, a famous fighting dog, falls off a train and is found by Donald Cass, a sweet-tempered village youth who gains the dog's intense loyalty by his acts of kindness. A wealthy woman is murdered by Jamber Niles, a reprobate who later attacks Donald in an effort to seize the church funds. Jamber is choking Donald to death when the dog intervenes and kills Jamber. Rin-Tin-Tin later saves Donald and his sweetheart, May, when they are attacked by a pack of bloodhounds belonging to "Cuckoo" Niles. The murder of the woman is traced to the late Jamber Niles, and Donald looks forward to a happy future with May.