Horse racing? If you're going to hate an animal sport, hate bull fighting. Those horses get the best care and treatment their entire lives. Then they run a 2 minute race every once in a while. Once their career is finished, they breed and live out their lives in green pastures. It's unfortunate when they get injured, but their trainers want to keep them alive and well for as long as possible. There is no profit in a dead horse. In some ways, I feel worse for the anorexic jockeys.
On a side note, the Kentucky Derby is the weekend of my birthday and we always watched it at my parties when I was a kid.