Klondike the German Shepherd dog works with the Northwest Canadian Mounted Police to track down smugglers.

Yak arrives at the Gilmore ranch where rustling has occurred. Gilmore blames a wild horse when it is actually his foreman Mays. After Yak catches and tames the wild horse, Mays gets Yak out of the way by having him arrested for murder. Mays and his men can now make one last raid.