DAYTONA BEACH, Fla. - Dog tracks are a horse-and-buggy bet in gambling's space age. And they're hurting. Everywhere. Bill and Cheryl Ruettgers sat outside the Daytona Beach Kennel Club during a recent Wednesday matinee, watching young handlers show off the greyhounds before race 7. Another 200 or so bettors joined them, a very small crowd searching the programs for a winner. It didn't used to be like this at Daytona. You used to wait in lines a dozen deep to place your bet, said 61-year-old Bill Ruettgers. You used to have a shot at a real score when you won,...