Buck’s father was the beloved St. Bernard that belonged to Judge Miller in the pastoral hills of the Santa Clara Valley in California, and his mother was a great German Shepherd. Judge Miller owns a huge mansion complex with other dogs, horses, stables, vineyards. Buck loves this calm existence, carrying the Judge’s grandchildren on his back and serving as the Judge’s faithful companion, as his father had been before him. However, one summer day in 1897, the Judge’s gardener unjustly sells him for a meager price, and from there the brave dog begins a long journey ending in Dyea, Alaska. Buck is sold away to a Canadian pair named Perrault and Francois in need of sled dogs. Arriving on the mainland, Buck encounters many obstacles in this cold, icy place quite unlike where he grew up.