I hope someone here has some input. I am staying at my sister's house for the week, watching her kids, dog and cat. Her cat has the smelliest waste you can imagine. You can smell it throughout her house, which is 2500 feet. You can also smell it through closed doors. She feeds her Natural Balance, which I thought was a good food. He is a 6 month old kitten, seems in good health otherwise. She got it about two weeks ago from the shelter. I recommended taking him to the vet. I have a cat and he doesn't make that kind of smell. He is on a different diet, and I've had him a year though. She thinks it is still early and it just from the change in diet from the shelter. OK, I think there could be some truth to the diet change upseting the stomach and stools, but this is an ungodly smell and it has been over two weeks now. Do you all think it is just from the change in diet? Have you had this experience before and know what might be causing it? Anyone experienced with Natural Balance food and know if it might be causing it? Just looking for any help or advice out there. Thanks.