Have you considered doing a review of Visionary Pets Dog food? I have been feeding it to mine for a couple years now. Great results. Limited stool. Maintain weight, coat and health on small amount.
I would love to see more Low carb dog foods out there. Obesity is often a problem in dogs the same way as people and Low carb as a diet worked very well for me. I suspect the lack of sugar is good for them too.