What breed of dog is Buck?

Buck, from Jack London's novel "The Call of the Wild," is described as a "powerful dog, with a coat of mingled black and white". He is not explicitly identified as any specific breed.

However, some interpretations of the story and the book's illustrations suggest that he might have been a Siberian Husky or a Saint Bernard.

It's important to note that breed descriptions were less precise in London's time, and the emphasis in the novel is on Buck's primitive instincts and his strength, rather than his exact lineage.