Your search for "hoof" revealed the following:
The Essential Hoof Book: The Complete Modern Guide to Horses Feet - Anatomy, Care and Health, Disease Diagnosis and Treatment by Susan Kauffmann and Christina Cline
Healthy Hooves: The EQUUS Guide to Understanding Your Horse's Feet and Keeping Them Sound
Lameness: Its Causes & Prevention: How to Keep Your Horse Sound for a Lifetime!
Modern Eventing with Phillip Dutton: The Complete Resource: Training, Conditioning, and Competing in All Three Phases