Are you claiming that Chihuahuas and Great Danes are not the same species? A male chihuahua can certainly fertilize a female Great Dane. They are interfertile and are the same species.
What this shows you is the extreme morphological variability that exists in a single species. This is why the fossil 'record' is imposed by the mind of man. With that kind of variability, you cannot say what came from what based on fossils. It's purely guesswork.
That's why we had the 'brontosaurus' fallacy for so long.
I'm skeptical. a 4 pound, 6 inches tall dog mounting a 180 lb, 35 in. tall bitch?
It was good of the creationists to straighten that one out for us.
It is straightened out now, isn't it? You do accept the science that straightened it out, don't you?