Winston, my 8 year old Doberman, has a very sensitive stomach and throws up with almost any kibble he gets. Currently he's eating Nutro Natural Choice Chicken meal, Rice, & Oatmeal formula for sensitive stomachs and he doesn't throw the food up but the problem is, is he throws up bile about 3 or so hours after he's finished eating due to hunger. It seems to just go right through his system. The only reason we switched him to this food is because our vet said oatmeal was good for dogs with stomach sensitivities. I don't really like Nutro, and would like to switch him over to something else but I don't want to make him sick again. Are any of the California Natural formulas okay for sensitive stomachs? If not, do any of you know of other premium quality kibble that usually does work for dogs like him?