Hopefully Shawna or one of the other experts on stones will chime in. Are you feeding him grain free? If you’re not, you should be. That will get the weight off him. Grain free is what caused my three dogs to lose weight rather quickly, too.
In my opinion you are feeding him entirely too small of an amount of food. The reason he’s always looking for food and acting hungry is because he is hungry. He’s starving. My 5, 6 and 7.3 lb. dogs each eat 1/4 cup twice a day. Even if he weighed what you think is his ideal weight, 1/2 cup per day is way way way to little. Please consider going to a grain free food, that will get some weight off, and feed him more. The poor little guy is hungry.
