Jack London 
The Call of the Wild [EPUB ebook] 

The novel is initially set in California, in the sunny Santa Clara Valley, in 1897. The dog Buck, the son of a male Saint Bernard and a Scottish Shepherd mother, lives in the large villa of a magistrate, Judge Miller. The 'Klondike Gold Rush’ begins, and the demand for sled dogs, the only means of locomotion in the frozen northern extremity of the American continent, increases, and therefore Buck is sold by his master’s gardener to a shady and brutal trafficker…………