Heads up: this is a GREAT book, and it's on sale this month for $1.99 for the Kindle edition.
The Eighty Dollar Champion: Snowman, the horse that inspired a nation by Elizabeth Letts
I read it last summer after a recommendation by my boyfriend's mother of all people, who is lovely but not horsey at all. It lived up to her recommendation - it's an engaging read and a good telling of a good story. It gets a bit repetitive in spots, but that's really its only flaw. Go, read!