Retrospective studies have been helpful for bringing to light information about animal health that may have not otherwise been noticed. In the past few years, there have been many research articles that have focused on spaying and neutering health risks versus benefits. A recent study from U.C. Davis found a greater occurrence of hip dysplasia, cranial cruciate ligament tears and certain types of cancer in spayed or neutered golden retrievers as compared to intact counterparts. The research suggests that health risks are generally greater for dogs that were sterilized less than a year of age. Golden Retriever Study
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