I bought these treat bones called Canine Vitalis and they have pepermint oil in them. I looked and looked for something with mint oil and no wheat but there was nothing so I went with these and so far his stool is fine. The bones are small and one small bone yesterday cleared up his smelly breath. I have no idea what was causing it but my theory is that wetting his food was causing it because he wasn't eating all of his food when it was put down and it absorbed all of the water and then the wet food was getting stuck to his teeth. I stopped wetting the food and gave him a rib bone and then one of these and he's good now.