You'd think horses were one of those animals that has horrible health due to humans breeding unhealthy animals to achieve a certain look, but no, they really are just naturally that fucked up. Horses' lungs bleed when they run at a certain speed. If their diet is too rich or low in selenium, their hooves fall off. If a horse's leg breaks, you kinda have no choice but to put it out of its misery. If a horse eats too much in a sitting it dies and they also don't have the ability to feel sated. Which means it will keep eating. Speaking of hooves, have y'all ever seen a newborn foal hooves? You don't want to, but, just saying.