In a study published in the JAVMA it says
"Neutering and the age at which a dog is neutered may affect the animal’s risk for developing certain cancers and joint diseases, according to a study published Feb. 13 in the online scientific journal PLOS ONE."
The article goes on to say that "Specifically, early neutering was associated with an increase in the occurrence of hip dysplasia, cranial cruciate ligament tear, and lymphosarcoma in males and in the occurrence of cranial cruciate ligament tear in females."
Many animal rights supporters and veterinarians push to spay and neuter all dogs and there are very good reasons to do so, unwanted litters is one good one, but are the risks of an unwanted litter (that could be stopped by keeping your dog confined while in season, basic pet ownership 101) worth the risk of possibly increasing the risk of a debilitating disease for your pet?
To read more about this and this study check out these links
Study finds neutering-disease link in Golden retrievers www.avma.org/News/JAVMANews/Pages/130401s.aspx