fermentable fiber is. There is beet pulp and soy hulls in the Gold so while this is "grain" it is not really "grain" it has a lot of fat and fermentable fiber versus grain like oats and corn etc.
Have you ever tried him on yeast? It might help support fiber digestion and certain forms have been shown to improve utilization of a range of nutrients.
Where are you located? Am I correct that you are in the Palo Alto area? If so I'm in the process of putting together a visit down there so if you would be interested in a consult I may be in your area in late March.
