Comanche

Andrew Apperley is in the East, visiting with his brother David, who he has persuaded to join him on his ranch in the West. Accompanying Andrew is a giant wolf dog named Comanche who is so wild that he has to be chained up at all times. But after Comanche saves escaped prisoner Single Jack Deems from drowning, Deems wants the dog for himself, and he follows the Apperleys west. Everything Andrew owns is imperilled by Alex Shodress, a clever and dangerous cattle thief who has learned how to steal with immunity from the law, hiding behind his gang of thugs. So when Deems shows up at the Apperley ranch to negotiate with Andrew for Comanche, Apperley tells him there is just one way he can win possession of the wolf dog, if he is willing to do it ...