Failure ( mentioned but not shown or described)

Your failures drive you to drink. You get mean less work in human towns work a horse could do but with less supervision and instruction needed. "plough a field" a farmer would ask for example and so you would hitch your self to a plough and word your way up and down a field in perfect rows in exchange for money an booze. You were horse and driver for the price of half.

You ended up mating with domesticated horses as the offspring was always a horse that was easy to train and smarter than the dumb bests humans normally settle for. You did so only to calm your drive during mating season and because humans paid well for your sperm, that is all you were to a breeder, just good breeding stock and easy to get to mate with the mares they wanted. You cared nothing for this offspring.

Eventually, your body would be found in an ally outside a human tavern, puke in your coat and a knife in your gut