Our lovely boy is constantly begging for food and has got quite fat. He did this last year at this time too but then lost it all in the spring. Any recommendations for food to satisfy his ever increasing belly? He is currently on royal canin dry food (sensible). The portions sizes are so small it's very easy to add a little too much at each meal and when he sits next to the food cupboard door crying we crumble too easily. He has us trained like Pavlov's dogs.