What was the one thing Soda really wanted in the book and what happened?

What Soda Curtis really wanted was that horse.  He was really into horses and he had been working down at the stable and riding that horse every chance he got.  But then it got sold and he was devastated.

The horse was described as a "buckskin horse" and it was kept at the stable where Soda worked.  The horse was named Mickey Mouse and it really "belonged" to Soda more than to its owner.

Soda was really proud of the horse.  He always talked about how he had an ornery horse -- he talked about it like it was his.  But it was a pure quarter horse and worth a lot of money and, like I said, the owner sold it and it was taken away from that stable.