Call of the Wild
What does Buck do that earns $1600 for Thornton in 5 minutes?
In chapter 6
In chapter 6
Buck wins a $1600 bet for his master by pulling a sled loaded with a thousand pounds of flour. After that Buck becomes the most famous dog in Alaska.
http://www.gradesaver.com/call-of-the-wild/study-guide/summary-chapter-6-for-the-love-of-a-man