The training venue was originally in the State of California . Three months before the filming started, in order to adapt to the cold and icy environment, they and more than 20 trainers moved to a snow-covered rural farm near the town of Smeiser. The initial training involves expressing emotions, such as barking and barking, as well as many head movements. As the training deepened, the sled dogs began to conduct skills training. Including from jumping up and tracking birds (using toys tied to a rope and filled with food to lure them) to crawling on the ice, and even training them to endure being buried in a snowdrift.
Each dog had two trainers working with them during the filming. Even pulling a sled is also a challenge for these dogs, because they instinctively pull the sled far away, but in the film for the plot needs, they are often asked to pull 5 feet away and then suddenly stop. In the training process, these sled dogs established a unique relationship in getting along with each other, and this social hierarchical system is basically consistent with the requirements of the characters in the film
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