Non Fiction - The Faraway Horses, The Eighty Dollar Champion, Whole Heart Whole Horse
Fiction - When I was younger, I loved pretty much every horse series ever: Pony Pals, Saddle Club, Heartland, Hoofbeats, Heartland, the Thoroughbred series, Keystone Stables, Canterwood Crest, High Hurdles, Chestnut Ridge. You name it, I read it. Riding Freedom and Paint the Wind by Pam Munoz Ryan. Firehorse by Diane Wilson is one of my very favorites.
I'm having trouble finding fiction horse books now that aren't either unrealistic rainbows-and-unicorn stories or have three pages about horses and a hundred and ninety seven about relationships and drama.