I've tried all sorts of things for my two current dogs, but their stools were never right, they didn't seem enthusiastic and kept begging for bread. Then I ditched the 'only meat' approach and tried something with grains, but that didn't work either. Now, in general, their poop is firm and they eat it.
We have a Vizsla who can't tolerate grain or maize, and a Rottweiler who also has issues with certain brands and types. Both dogs really enjoy this food and it suits them well. The price is right too.