Synopsis by Janiss Garza
Peter the Great was one of the dog stars to come in the wake of other successful canine luminaries as Rin Tin Tin and Strongheart. There isn't much to the story of this United Artists picture -- as usual with pictures like this one, the dog's the whole show. Bob Blake (Frank Hagney) murders Hadley, a prospector, and takes over his cabin. Blake, however, cannot make friends with Hadley's dog, Arno (Peter the Great). Arno clearly dislikes him, so he sells him to Dave Wright (George Sherwood), a doctor. Hadley's daughter, Polly Ann (Frances Teague), shows up and Wright rescues her from Blake's attack. The evildoings of the villain are not over yet -- he convinces the villagers that Wright is the one responsible for Hadley's murder. Wright manages to prove himself innocent and forces Blake to confess. Blake escapes from the lockup, however, and is pursued by Arno, who is still determined to avenge his master's death. This he does by driving Blake over a precipice.