Horses play a unique role in human activities, for both work and recreation. From the ranch to the racetrack, an understanding of their behavior and needs is vital for humans to ensure their well-being. Providing a comprehensive, scientific overview of horse behavior and its relation to welfare, this updated edition includes new developments in the understanding of the relationship between physiology and performance, and the neuro-chemical basis of stereotypic behavior. It is expanded to address the important topic of welfare from both a fundamental and practical viewpoint, and will serve as an essential resource for veterinarians, equine professionals and horse owners as well as students of veterinary and animal sciences.