Being from MS and feeding a fat/protein low carb diet, I can tell you that I've went into the mountains and won. The dogs didn't fall flat on their face.

I don't believe anyone said anything about a steady pace. Sled dogs don't run a steady pace during their races, nor do bulldogs when being conditioned. The dog's primary energy source is fat. That's a fact. So that means what?? That they're going to utilize fat MORE than carbs as they're not needed as they are in humans. Those facts aren't debatable. People will continue to carb load their dogs, but they fail to realize they're simply shortchanging their dog.