BARBARO1 asks: "My Sheltie is a little oversized and overweight. He's hungry all the time, but no diet dog food has worked. We feed him two cups a day, he walks, he plays 30 minutes each night, but his weight just won't go down. He's eating Pedigree Weight Loss right now, but he's gained .4 of a pound on it. I have exhausted every avenue. Our vet doesn't take the problem seriously, but I am very worried. He weight about 4 pounds. That's not as bad as it seems because he's probably 17" and stout, but I'm not kidding anyone, I know he's overweight."