Here are a few relevant quotes from the novel The Call of the Wild by Jack London about sled dogs:
"Buck did not read the newspapers, or he would have known that trouble was brewing, not alone for himself, but for every tide-water dog, strong of muscle and with warm, long hair, from Puget Sound to San Diego."
- This quote foreshadows the coming hardships that Buck and other sled dogs will face as the Klondike Gold Rush increases demand for their labor.
"He was accustomed to obey promptly any command of the men about him, and to work conscientiously under the direction of the dog driver."
- This quote describes Buck's initial nature and training as