[Modernman]

They cannot "interbreed" because of size--a Great Dane pup would kill a papillion mother. This brings a certain surface appeal to your argument, but the gap between type and species is a vast one

The point is, with dogs we are observing speciation in action. Dogs at either end of the spectrum cannot inter-breed, whereas dogs that are closer together physically (say, a rottweiler and a standard poodle, imagine what that would look like) can. If we keep doing what we're doing with dogs, down the road the descendants of various breeds will certainly be considered different species.

Remember, we've only been messing with dogs for a few thousand years. Where do you think we'll be a million years from now?

[Mamzelle]

re: The point is, with dogs we are observing speciation in action. )))

You could just as easily assert that we are observing extinction in action-- you're assuming that some new thing is going to happen. I see a history of dwindling diversity in species, not expanding. Not that this makes me happy--but in a million years, I wonder if humans will be utterly alone with chickens, sheep and goats.

[shubi]

"Where do you think we'll be a million years from now?"

Burned to a cinder because creationists caused us to lose all of our scientists that would have protected us from nuclear war.