As Grey Beaver and White Fang arrive in Fort Yukon, they encounter Ned and his fighting dog. As they leave, Ned instigates a fight between the two dogs and White Fang wins. Beauty Smith offers to buy White Fang, but Grey Beaver refuses. Later, when Grey Beaver is selling mittens, Beauty Smith orders Curtis to steal his necklace. The next day, Beauty Smith and Curtis blackmail Grey Beaver for White Fang, forcing the chief to surrender the wolfdog.
Beauty Smith then trains White Fang to be a fighting dog in order to make money. White Fang defeats all the animals pitted against him, including several dogs and a lynx, until a bull mastiff and a doberman are brought to fight him simultaneously. They easily defeat him until a marshal named Weedon Scott stops the fight and forcefully buys White Fang from Beauty Smith. As Hank calls out for Weedon, Beauty Smith knocks him unconscious and swears revenge against him.
After Weedon and Maggie tame White Fang, Curtis has followed Weedon to Crystal Creek and informs Beauty Smith about his plan to steal White Fang back. They hire Jim Hall to finish Weedon up as they go to Crystal Creek.
Jim Hall ambushes Weedon and prepares to kill him, but White Fang arrives in the nick of time and attacks him, allowing Weedon to knock him unconscious. Weedon and White Fang go back to the cabin, where they find Beauty Smith and Curtis holding Maggie hostage. Maggie begs Beauty Smith to leave them alone, but he hits Weedon on the leg and tries to teach him a lesson. However, White Fang grabs the cane from Beauty Smith and breaks it in half. Maggie frees herself from Curtis, allowing Weedon to hold him down. White Fang chases Beauty Smith into a shed and threatens to kill him. However, Maggie orders White Fang not to kill him and he spares him. He and his henchmen are later arrested by Hank and taken to prison.