FantasyIreland said:
Why is it when a horse gets a leg injury they are more often than not put to sleep?
Because a horse has to be on 4 legs to survive, its kind of their instinct. So if the fracture is that bad that even after surgery it can't walk then its better off being put down, due to the pain it'll cause the horse. Some fractures can be resolved with metal plates, but a lot of fractures are too serious, plus it takes four months for a broken leg to heal, a horse couldn't cope for that amount of time off its legs.