Who was Dub in call of the wild?

In "The Call of the Wild" by Jack London, Dub is a mixed-breed dog who serves as a companion to Buck, the main character. He is part of the sled dog team and is characterized by his clumsiness and lack of strength compared to the other dogs. Dub often faces challenges and hardships alongside Buck, contributing to the overall dynamics of the dog team as they navigate the harsh realities of life in the Yukon during the Gold Rush.