In The Call of the Wild" which dog is sled-team leader after the death of Spitz?

http://www.cliffsnotes.com/literature/c/the-call-of-the-wild/summary-and-analysis/chapter-4

In "The Call of the Wild" by Jack London, the sled-team leader after the death of Spitz is a dog named Buck. Buck, the protagonist of the novel, was a domesticated dog who was kidnapped from his comfortable life in California and brought to the harsh environment of the Yukon during the Klondike Gold Rush. As Buck adapts to his new life, he eventually becomes the alpha dog and takes on the role of the sled-team leader.

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