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In this December 17, 2012 photo provided by Colorado State University, Dr. Rodney L. Page, Professor of Oncology and Director of the CSU Flint Animal Cancer Center, sits on a sofa with a golden retriever, Winston, in the lobby of the James L. Voss Veterinary Teaching Hospital at Colorado State University, in Fort Collins, Colo. Winston is a pet of a co-worker, and not part of the cancer study. The Golden Retriever Lifetime Study will be the largest and longest study of dogs ever conducted, said Page, the study's principal investigator. (AP Photo/Colorado State University, Joe. A. Mendoza)