We were feeding Shadow 5 cups a day, but with his daily PB, cookies, marrow bones, etc. his weight started to creep up. Since we know he likes his treats better than his meals (and since we feed him healthy treats) we decided it made more sense to cut back on his meals.
He also gets extras mixed into his meals, like eggs, veggies, etc.
He's maintained his weight for over a year now and we always get compliments on how svelte he looks