Was buck a real character sledge dog in The Call of the Wild?

Buck, the main character in Jack London's "The Call of the Wild," is not based on a real sledge dog but is a fictional creation. However, London drew inspiration from his experiences and observations of the Yukon during the Klondike Gold Rush, where real sled dogs played a crucial role. Buck represents the struggle for survival and the instinctual return to primal nature, embodying the spirit of the wild that many real sled dogs exhibited.