I've got my SirMacKellen on Royal Canin Medium Adult Dog at 7 months old and he's around 17 or 18 lbs but he's pure muscle and still definitely has a waist line that tappers back from his rips to right before his hips. We run/walk him a bunch and I think that has a lot to do with it. I actually just got on and started searching the forums to see if I was feeding him ENOUGH, but he's getting 2 cups of food a day and the occasional doggy biscuit or pieces of dog food for treats. So I must be feeding him enough he's just very active and I worry about him looking "thin" sometimes. Though in relations to most of the real life Corgi's who look like sausages I guess its not a lot to go off of. Suggestions and comments?