Good condition children's book

The book centers on a boy named Willy who enters a dog sled race in order to win $500 to pay back the taxes on his grandfather's farm. It is written in simple prose and is set at an indeterminate time in the American Old West. The book was inspired by a Rocky Mountain legend that Gardiner heard when he visited Idaho.^[1] Stone Fox was originally intended as a screenplay but became a book at the suggestion of a producer