Article Photos: Golden retrievers key to lifetime dog cancer study 5/5

This December 17, 2012 photo provided by Colorado State University shows Dr. Rodney L. Page, Professor of Oncology and Director of the CSU Animal Cancer Center in the College of Veterinary Medicine, at Colorado State University in Fort Collins, Colo. The Golden Retriever Lifetime Study will be the largest and longest study of dogs ever conducted, said Page, the study's principal investigator. The study will focus on three cancers that can be fatal to the dogs, including bone cancer, lymphoma (cancer of the lymph nodes) and a cancer in the blood vessels called hemangiosarcoma.  (AP Photo/Colorado State University, Joe A. Mendoza)