The size of the dog in the fight isn't everything, but because knowing which limits are imagined and which ones are a reality is a factor, so is the size of a dog in a fight, to some degree. The size of the dog in a fight doesn't determine what the
dog really is, that depends on the
dog, not on its size. Weakness isn't a size based trait, and neither is how much fight is in something, those traits depend on the individual and not on the size of the individual. Not all smaller
dogs have more fight than larger
dogs, and not all of them have more fight than mouth even, it depends on the
dog. The same is true for larger
dogs. Not all larger dogs are underestimaters because they are larger. Recklessness and overconfidence aren't exclusive to only larger dogs, or only smaller dogs. It depends on the
dog.
Size of the dog in the fight isn't everything, but it's a factor. Smaller
dogs are not without faults any more than larger dogs are. Hopefully no
dog loses it's humility and thinks it's changed into a different
dog than the one it was as a pup, no matter it's size or experience (recent or past).