Of course when we want truth, we need to follow many leads and see where they get us. Here is information about hairless dogs and cats.
List of Hairless Breeds, Dogs with no hair/fur
It is interesting the American Hairless Terrier, also breaks out in a sweat when hot of frightened, because dogs do not sweat.
PBS is showing shows about the evolution of dogs, and evidently, all the qualities we see in dogs, were in the original dog. The variation is the result of breeding qualities out.
The same would be true of humans, with the first humans having all the qualities we now see in our diversity.
The evolutionary theory says we share an ancestor with apes and monkeys, and that all mammals share an ancestor, which shared and ancestor with reptiles, which shared an ancestor with fish. Back to all dog qualities being the first dog. We are learning some surprising things, such as when a wild black wolf is selectively breed for tolerance of being close to humans, not only does the behavior in the next generation dramatically change, but so does the color of the dog!
For darn sure, we are learning more through science than we expected, and we are learning a lot more about how things are as they are, then we could learn if we restrict ourselves to studying holy books. Knowledge leads to enlightenment, and enlightenment resolves conflict and other troubles. Chardin, a Catholic priest, wrote that evolution is Gods plan, and we are God's consciousness. The new cosmology, using quantum physics, gives us an idea of how this evolves to the heaven of immortal life.