Stick with raw feed, if you are able to get uncleaned tripe (the stomach unclean wall or what we call black tripe) cut into smaller strips and feed it does marvels, dogs love it too. Only learned about raw feeding later in life, wish I had known more at the time - Google "Raw Feeding for Dogs" and read @krazyuncle
I'll have to look into nutrition for Karl more... I try to buy dog food with out grains, but what your talking about is a whole other level of thought... thank you, I'll think on it... I'll also ask Karl, but when it comes to food he's a bit hard to understand when he's drooling...