Does anyone know what natural chicken flavor or natural fish flavor is? I have my dog on Wellness Core Original, which has natural chicken flavor. I am transitioning her to Wellness Ocean Fish formula, which has natural fish flavor. Although she is doing well on both foods, I am concerned since I read on the internet that "nautural flavor" may have manure in it. And I don't understand why such an expensive, supposedly premium food would have this ingredient. Why would it be necessary to add natural chicken/fish flavor to make the food more palatable? Without this flavoring would dogs not eat the food? Any input would be appreciated. Thank you!