My eight year old Australian Shepherd is overweight, has always been overweight, and kept getting more overweight. We tried diets, counting calories and so on in conjunction with the Vet. She was eating less calories than required for her ideal weight, let alone what she weighs now. Then the Vet. suggested a prescription, Science Diet, metabolic food. It is designed to boost metabolism. She started off eating MORE food with More calories than her normal food. She is losing weight. I can't figure it out.