every dog’s mitochondrial DNA is 99.9% the same as a gray wolf’s—so close they are the same species. One-third of that 0.1% difference is in the genes for fat and carbohydrate digestion. Half is in the brain and the tiny remainder ... controls the time and rate of physical development and accounts for the vast differences in size and shape between breeds.So that's the only difference between this creature hiding under the futon:
and these creatures?
(Maybe get your grain of salt ready. Mitochondrial DNA is only a fraction of total DNA; I'm sure corgi awesomeness cannot be contained in 0.1% of any genome.)