He is on TOTW pacific stream formula. I have tried several different kinds of food and even tried raw food before with no luck either. Before this food he was on duck and potato by ivd and he has also been on natural balance before. Everyone of these foods he does the same on so I dont no if it has anything to do with foods because I have checked the ingredients in every food I have fed him and he is supposely not allergic to anything in them. Also I wash his things in vinegar and water so I don't think that would have anything to do with it either and he also sleeps on a pillow in his crate that has a silk pillowcase since he is borderline allergic to cotton.