Dogs are one species. Their variation is a result of long-term purposeful breedi...

		cwal37 on April 4, 2014 \| parent \| context \| favorite \| on: Rare 'goat-sheep' born on Irish farm Dogs are one species. Their variation is a result of long-term purposeful breeding and a "slippery" genome. Similar deal (not so much the slippery genome) for horses and housecats. I think you're confusing breeds with species.