Mary Stanton has a two book series called The Heavenly Horse from the Outermost West" and "Piper at the Gate. The novels are the story of the desperate struggle for survival of the sacred Appaloosa breed of horses against impossible odds. It is in the sci-fi section. I love it
Roperchick, have you read an old book called "Smokey, the Cow Horse by Will James.
Another good "old" book is "A Girl and Five Brave Horses", the true story of a young girl from SC that dove horses off a 40 foot tower into a tank or pool of water. I so loved the book I searched until I found a hard copy. Disney did the movie Wild Hearts can't Be Broken, good but not near as good as the book
Stallions are from Mars; Mares are from Venus; but Geldings, well, they are from heaven !!