A glass has certain dispositions, for example the disposition to shatter when struck. But what is this disposition? It seems on the one hand to be a perfectly real property, a genuine respect of similarity common to glasses, china cups, and anything else fragile.
The first saddle is believed to have been invented in 365 AD by the Sarmations. Proud horsemen who used their horses in battle and also sacrificed them to the gods, their saddle creations were brought back to Europe by the Huns.
A common example of the feral horse type is the Mustang. The Mustang is, in part, descended from the Iberian horses brought to the Americas by the Spanish, but most herds also have ancestry from other breeds. Therefore, the famous Mustang hoof strength is in part a result of natural selection and environment.