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I used to ride daily and spent years dealing with horses - if they didn't enjoy it they wouldn't do it well and wouldn't be in the big races. It is unpleasant when a horse dies, but death and pain are part of Life for all animals, we can't prevent it, and they do live really well, doing something they enjoy for people they love, and they die, when they are injured, quickly and as easily as possible - more than if they were wild. And it always hurts the people concerned, the trainers, owners, riders, who by and large love the animals and care for them excellently.