A reference work for the sport horse breeder, with over 200 full page pedigrees, that traces the tremendous sport abilities of this breed from the 1600s until the present. Outline: *American Running Horse history from 1634 to 1925 *the major mid-gait bloodlines in America and England * Equine genetics and their relevance to sport horse breeding * American Trotter 1818-1879 *Pacing Running Horse and its Narragansett Pacer branch, Morgan Horse and Canadian Pacer bloodlines * American Standardbred 1879-present * American Trotter and Standardbred in International sport and breeding from 1829 to present * Standardbred and its bloodlines in modern Olympic style sport and breeding *American breeds and breeders in the modern International market place