Gable is Jack Thornton, on the hunt for a gold mine through the tundra with his sidekick Shorty (Oakie). As they struggle through the mountains in the bitter cold, they encounter Claire Blake (Young) who is stranded alone after her husband left her to search for food. They discover that Claire and her husband were after the same gold mine. Aided by their trusty dog Buck, they find the mine and along the way Claire and Jack fall in love. Their happiness is short-lived, however, as Claire's husband reappears and a rival turns up to claim the mine as his own.

Reviews

Movie Mirror, September 1935

Jack London's famous book of the out-of-doors brings Clark Gable as the miner, Jack Oakie as his wisecracking pal and Loretta Young as the wife of another miner who casts her lot with Gable and Oakie. Buck, a St. Bernard dog, is the hero of the show.

Silver Screen, November 1935

Fair. The great open spaces of the Klondike lure our friend Clark Gable in this romantic Jack London novel, and way out there we also meet Loretta Young, Jack Oakie and Reginald Owen emoting picturesquely--in spite of the climate.

Quote-able Gable

“Quiet everybody! Ladies and gentlemen, your attention please! You’re about to take your last look at
Mr. Thornton’s handsome smiling face! So make the most of it you weasels!" first line

“My stomach wants to know how my credit is…”

“That dog belongs to me. I bought him, Smith, and I don’t allow my dogs to be shot. T
hat is of course unless I shoot them myself.”

“Listen you—you’re my dog and I’m your boss.
The sooner you learn that the easier it will be for both of us.”

“Make yourself at home, Buck!”

“He isn’t dead and he isn’t a HE!”

“Sticks and stones may break my bones but words can never hurt me!”

“Would you mind keeping that fat snoot of yours out of my affairs?”

“I wanted you. And I took you with us. Well, I’m keeping you.”

“Well, I’ll be seeing you.”

“Shorty, what’s that? Where did you get it?” last line

Behind the Scenes

Gable was loaned to 20the Century Fox (much to his chagrin) for this film. Young was loaned from Warner Brothers.

Shot on location in northern Washington state in December and January, the production schedule called for the film to be completed in six weeks. Because of blizzards that snowed in the cast and crew and froze the cameras, it ended up taking nine.

Director William Wellman recalled that Gable became very close with the dog portraying Buck.
When they filmed the scene where Buck is struggling to pull the 1,000lbs of weight, the dog wouldn't leave Gable's side. So they positioned a girl dog in heat at the other end so the dog would struggle to get to her.
When the shot was complete, they took the girl dog away and
Gable said, "I feel like I just double-crossed my best friend."

Wellman grew tired of Gable showing up to the set late and carousing after hours with Oakie
and the crew, gambling and drinking. He confronted him one day on the set and claims he would have punched him
in the face but "I needed that handsome mug for the picture."

Gable and Young had an affair during filming.  Only the cast and crew of the film knew about it then and the affair ended after filming wrapped. Young became pregnant and had the baby, a girl named Judy, on November 6, 1935. 
Gable never admitted parentage and Young put the child in an orphanage and then "adopted" her months later.
 She only admitted the truth to Judy in the 1990's, shortly before her death. Judy wrote a book about the experience
being the secret love child of two classic stars, called Uncommon Knowledge. Read more about it here.