In all seriousness, I would imagine that any raw-fed dog that is "always" in a state of stress would therefore have a metabolism that "always" is converting glucose from glucogenic amino acids & glycerol
It's additional work (not the work the dog is used to, day-in and day-out, but sudden EXTRA work) that can require the additional carbs in that moment
Sled dogs on the run are sled dogs on the run, and they really don't get any carbs as far as I know.
Wolves on the run, hunting for days, are wolves on the run, hunting for days, and they're not eating much carbs at all (if any).
The fact is, dogs can digest and process carbs (provided we cook them), but dogs really didn't eat much carbs at all in the "wolf" stage of their development.
In fact, it is generally thought that it was the wolves' adapting to our use of carbs, and being able to digest them (note: implying they're not used to eating them), that led to wolves being domesticated.
And, as far as bulldogs go, I am pretty sure (having fed some incredibly wound-up, intense-ass dogs in my day ... that never sat still and never stopped trying to destroy shit all day, every day) ... and having fed them a 100% raw diet ... that they sure as shit lacked neither energy, mental alertness, or stamina
Jack