What breed of dog is Buck? Buck is a hybrid dog, which is a hybrid of a Labrador and a Husky.

Buck is a skewer born to St. Bernard and Shepherd. It is mentioned in the book that it inherited its huge body and weight from its St. Bernard's father and its appearance from its shepherd mother.

"The Call of Wild" tells the story of Buck being a beloved dog from Judge Miller's family. After being educated by civilization, he has been living in a warm valley in southern California. Later it was sold to Alaska, a cold and remote northern United States and rich in gold, and became a sled dog.

The work uses the experience of a dog to express the dog in a civilized world to return to barbarism under the pressure of his owner. It describes the dog and also reflects the human world. This work continues the theme of "survival" in Jack London's novel: life always gains meaning and strength in the process of constantly struggling to survive.