I, personally, would rather give them some type of carbs so that the CNS is readily fueled everyday as opposed to not giving them some and having them divert things away that could hinder other metabolic pathways by adding a strain on fat and protein metabolism. Given the way some bulldogs are actively running their chains everyday, I would say it's not a bad idea to give those dogs carbs either. I think that's the main reason when feeding dogs, a person should look at the activity level of the dog and make a proper determination on what is needed. A dog like my Jasper dog is almost always a high stress individual, even when in a pen. So he gets more of everything in order to offset his energy requirements. For ME, it's not always about the stress of working. A lot of dogs are stressed simply by their existence.