Maybe there’s more than one mystery here.
Dogs, left to breed amongst themselves will eventually revert to “primitive type”.
Some breeds still retain that type, such as Dingos, Ibizan Hounds, Pharoah Hounds, *all* of the Podengo/Podenco types and Spitz types.
When you strip away all of man’s genetic “interference”, those dogs are what original dogs looked like.
I had a Carolina Dingo. That was one fine dog! I named him Blue because of the tint of his coat and the color of his eyes. Beautiful dog.