The Life of Dayton O. Hyde examines the inspirational life of wild horse hero and one of the last old-style cowboys, Dayton O. Hyde. Through 25 years of steadfast determination, this modern-day renaissance man is preserving part of the American West on his breathtaking 12,000-acre prairie land Black Hills Wild Horse Sanctuary in South Dakota, where more than 500 mustangs rescued from the controversial wild horse roundups in the West now run free.