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Before Rin-Tin-Tin there was Strongheart, the trained police dog belonging to screenwriter Jane Murfin. This picture is a double romance of the frozen North -- human and dog -- and the dogs' love affair is the more believable of the two. David (Harold Austin) thinks he has killed a man during a fight over his dog, Strongheart (himself), so he escapes to a small town far up north. The only girl living up there is an orphan, Sally (Irene Rich), and David falls in love with her. Strongheart decides to search for love himself and lures Lady Jule, a female shepherd, away from a pack of timber wolves. It turns out that David has competition for Sally in John LeRoy, an unscrupulous fur trader (John Richardson). David earns money to go home by entering himself and Strongheart in a dog race, which he wins by taking a risky shortcut over a glacier. Sally, meanwhile, finds Lady Jule and her puppies in an abandoned warehouse, along with a mound of stolen furs. LeRoy discovers Sally there and attacks her. Strongheart goes for David who saves Sally and gives LeRoy a sound thrashing. David's father arrives with the news that the man David injured is still alive, so he is able to return home with his girl and his dogs.