A story of friendship between a lonely little boy who braves Alaskan blizzards in search of gold and his loyal companion Buck, the courageous and faithful German Shepherd.

Buck, the dog, enjoys life until he is sold by a spiteful butler and sent to the Klondike as a sled dog. Once there, Buck sets off on snowy adventures. We also meet a boy, John, on his way to the Klondike to find gold so his sister can get an operation.