University of California, Davis announced:
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 new study of golden retrievers by a team of researchers at the University of California, Davis. The study, which examined the health records of 759 golden retrievers, found a surprising doubling of hip dysplasia among male dogs neutered before one year of age. This and other results were published Feb. 13, 2013, in the online scientific journal PLOS ONE. "The study results indicate that dog owners and service-dog trainers should carefully consider when to have their male and female dogs neutered," said lead investigator Benjamin Hart, a distinguished professor emeritus in the UC Davis School of Veterinary Medicine.
To read more click here.
A word of caution - This study included only Golden Retrievers, a breed with a 60% or higher cancer rate. Lots of variables affect health in dogs. For instance, little dogs, under 15 pound, have a very small chance of dying from cancer. Read my post about causes of death in purebred dogs.