I also want to illustrate the powerful muscles in the hind quarters. If you must, yes, I'm painting horses asses.
“Anatomically speaking, they run on their toes. That makes them very fragile. A human being would have to put his weight on his middle finger to duplicate the proportion of weight the horse hoof supports as it hits the ground". - Lawrence R. Soma, professor of anesthesia and clinical pharmacology at the University of Pennsylvania School of Veterinary Medicine