I hate gambling with a passion having once worked in a bingo hall and watched old lady chavs spunk their entire pensions in the fruit machines between games. Its distressing that horses are put down at the drop of a hat. Leg injuries are a death sentence. Greyhound racing is equally foul.
However, were it not for these industries existing in the first place most of these creatures would be denied life itself. We don't need horses for work these days (we probly will soon though and the french are way ahead of us) and wouldn't bother breeding them otherwise. Same with greyhounds. I can't decide if its better that they got a chance at life or if they were just born to suffer?
If you like gambling I have invented a cruelty free version. Basically get one of those poles with a metal claw on the end that are used to pick up rubbish and as disabled aids, then take all the money out of your wallet and stuff it down the nearest drain. Then try and fish it out with the claw.
You might be lucky.