Like others have said I wouldn't go by the breed standard. It sounds like maybe you are. ?? My female is way over the standard both in height and weight. Female Giant Schnauzers should be between 70-75lbs. Mine is 92lbs and at a perfect weight...for her. I feed her by her needs(ie activity level, etc) She eats 5c of ProPlan Performance a day and she does very well on it. Have you tried the "rib check method"? What does your vet say?peteducation.com