LOS ANGELES (AP) — When Jay Mesinger heard about a study seeking golden retrievers to help fight canine cancer, he immediately signed up 2-year-old Louie. He and his wife know firsthand the toll of canine cancer: Louie is their fourth golden retriever. The first three died of cancer. "They all had long lives but were taken by complications from one kind of cancer or another," said the businessman from Boulder, Colo. For Louie and 2,999 other purebred goldens, it will be the study of a lifetime. Their lives — usually a 10-to-14-year span — will be tracked for genetic, nutritional and environmental risks to help scientists and veterinarians find ways to prevent canine cancer, widely considered...
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