Este nuevo trabajo de investigación muestra el proceso de creación de la morfología que distingue al P.R.E. También distingue los cambios que ha experimentado la raza desde que se creó y que motivó su selección, así como la vinculación con el medio geográfico andaluz. Edición de lujo, con excelente fotografía en color descriptiva de la anatomía equina. The author also explains why elevated gaits were prefered and the origin of "el campaneo". He proves false other theories such as the influence of a certain geographical area (Marismas del Guadalquivir), and climate, as determinant factors in the Spanish Horse characteristical morphology and movements, the correlation between the fighting bull and the back shape of the Spanish Horse, or this horse´s most common colour (grey) with the sun of Andalusia. The reader will learn about the Spanish Horse original croup, neck, and the cause of the so called "gato"(fat neck). The writer proves that "Solo", the most famous and considered the purest "Carthusian" horse and original ancestor of the "El Bocado" blood line, was not part of that line, but just a horse that Mr Vicente Romero acquired and rebranded with his brand. He present documentary evidence which clearly indicates that the Spanish horse is not the result of natural evolution but rather the product of the greatest genetic project of history, the one undertaken in 1567 at the orders of King Philip II in the city of Cordoba for the purpose of creating a breed of horses which would have specific pre-established characteristics."