Different species are just social constructs. The idea of what is considered "human" and what is concidered "dog" is based on stereotypical ideas on what humans and dogs are, in the end species are nothing but made up categories. We might have agreed that hairless looking, two legs, two arms and hands having bipedal apes are called humans, but that's just what it is; a social agreement.
Who says a dog cannot have these features too? "Humans" in fact have short hair all over their bodies, which can be considered a fur, which is something dogs have. And some dog breeds like chinese crested dog have short hair and more long visible fur in their heads just like us too. Dogs sometimes too walk on two limbs, and humans are able to walk on four limbs, (which once again we have socially agreed to refer to as "legs" and "arms") are social creatures and omnivores, just like the animals that we stereotypically consider "dogs". The idea that "humans" and "dogs" are completely separate things is unscientific, and in lot of indigenous cultures the boundaries between species are blurred. Shapeshifting myths are prevalent across different cultures; in different cultures different animals are considered human's ancestors, it has been believed animals can possess human spirit and so on. This idea of strictly separated species is very colonial, it is based on specieist western cishetero supremancy.