My German shepherd have become famous for their "hereditary skin allergies" and some vets are now referring to them as "tumor factories" as well. They are riddled with genetic defects - so the experts tell us. I disagree. While there is no doubt that hereditary problems do exist in Golden Retrievers, it is my contention that many, (many!) of the chronic problems besetting our dogs have their true roots in the commercial diets we feed.