If the defect (hole) in the part is small enough or the path length for the leak is long enough, it will be almost impossible for the fluids to flow through the hole (leak). The fluid properties that affect flow are pressure, temperature, and viscosity.
Though the answer seems to be correct, but when taken from that perspective, one will not keep focused on the real reason. The main reason why we shoe horses is for work, which then determines the style and the type of shoeing for the individual working horse. Various types of historical horseshoes.
Today great care needs to be taken in selecting a horse that is the correct size for you. The bone structure is so very important to look at and then the size of the horse. If a horse has tiny legs and a huge body, the horses can hardly carry themselves.