Most Helpful Girl
The reason Horses do so badly after breaking or injuring a leg is because they're actually more like hyper-specific fingers. There's very little muscle, just tendons and cartilage.
Also horses lungs bleed if they run at a certain speed and their hooves fall off if they eat too much/little selenium.
They've also been observed eating meat many many times.
Don't ask why I know so much horrifying shit about horses