Does anybody feed more than the recommended serving size with orijen? We feed him the recommended 3 cups a day (based on his weight-68lbs and being an active dog). After a touch of colitis, he went from 68 down to about 61-62 lbs so we upped his food to 4 cups a day for the course of one bag. He seemed to fill back out to normal, but already seems to be thinning out again after being back on 3 cups for about a week now...should I increase him back up to 4 cups a day or perhaps just add something else to his meals? Any thoughts?