Okay so I\'ve had my siamese for about 4 or 5 months now, and he\'s had loose stool and/or diarrhea the whole time. I\'ve had him on Natural Balance Low Calorie formula because I also have a fat Siamese and they don\'t get much exercise. There are no biproducts or gluten in it, and its all natural. I had him eating canned food once a day sometimes, and it was all natural and bi-product/gluten free. But he hasn\'t had that in a month. Why is he having diarrhea???