Tween horse books and horse book series for tweens (and tween girls, especially) are much-loved by fans of the genre. I don’t read too many horse books, but I do have several horse fans in my life that it was almost essential to make this list. Contrary to popular opinion, boys also read horse books and in this list of middle grade books about horses, I was pleased to find several with boy protagonists. If you have a kid (or you are) nuts about horse books for tweens, this list is for you!