A sinus surgery lasted 21/2 hours. Four more were spent taking a bladder stone out of a show horse. Dean Richardson was still at a friend's equine hospital in Florida on May 20 as Barbaro, the Kentucky Derby winner, was saddled for the Preakness Stakes. Richardson wasn't going to miss the race. "He had blood all over him, and he was doing it in flip-flops, so we hosed him off," said Byron Reid, a veterinarian in Loxahatchee, Fla., just outside West Palm Beach. The two men watched the Preakness on a six-inch screen in the hospital. "You could see enough,"...