I don't like the term barf, it's a trademark. Raw feeding is the most natural thing there is I don't need an Australian vet to tell me about it, making money off it in the process. I believe feeding raw reduces the possibility of bloat. I have no idea how much time the food spends in there. How would you calculate that? I suppose I could throw a small cooked indigestible bone with the rest of the food and wait for it to come out. However dogs can hold stool for longer periods than would actually indicate digestion. I did find out that frying meat in oil greatly increases the time of digestion and the cooking may even render it indigestible. This I discovered by accident feeding the dog some fried leftover people food and the dog vomiting later in the day. What came out was the part that was the outside and was more fried, the rest was digested.