I've been told that by many Vets. The genetic mixing really helps. I'm not sure if this is true but one told me most of the golden retrievers in the US can be

I've been told that by many Vets. The genetic mixing really helps. I'm not sure if this is true but one told me most of the golden retrievers in the US can be traced back to just three male dogs from the mid-70s. He said its the cause of a lot of their hip and cancer problems that are common in the breed.