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For thoroughbred racehorses in Puerto Rico, success can be a matter of life and death. Many losers don't make it off the racetrack grounds alive. More than 400 horses, many in perfect health, are killed each year by lethal injection at a clinic tucked behind the Hipodromo Camarero racetrack, chief veterinarian Jose Garcia said after checking clinic log books going back seven years. Unlike on the U.S. mainland, where many former racehorses are retrained for riding or sent to special refuges, the animals have few options in this U.S. Caribbean territory. Owners say caring for and feeding a losing racehorse is too expensive. "If it doesn't produce, after a while I give it away or I kill it," said Arnoldo Maldonado, 60, a businessman who races about five horses a year. "It bothers me, but it has to be done because there is no money to pay for them ... I'm not going to keep losing." The killings also bother veterinarians who carry them out.