How absolutely and proportionally long were Secretariat’s legs? Nobody knows or cares, because they do not know what to look for. Does SPEED.have several different causes? Or a thousand genes? What is known is that speed will cause loss of leg function.

Read Hildebrand, M. 1987. The mechanics of horse legs. Amer. Sci. 75: 594-601 so that you get the legs crystal clear, right ?