I must confess that I am not a horse person. My apologies to all of you who are, but please don't stop reading because I'm about to recommend a couple of great horse books. If, like me, you just want to get out of this "stinking fresh country air" (quote from my four-year-old self), please also keep reading because these amazing authors sold me on their novels despite the fact that they're both about horses.
The Scorpio Races, by Maggie Stiefvater
Stiefvater made me love these monstrous horses as well, with a world so seamlessly built into her story that I'm going to have to write an entire critical essay this month on how she did it. A fantasy without information dumps? A rare creature indeed, and I'm on a quest to find more. You don't have to like horses OR fantasy to LOVE The Scorpio Races, Stiefvater will sell you on her story either way.
Racing Savannah, by Miranda Kenneally