- Frank Hailer, Lecturer in Evolutionary Biology, Cardiff University
- Read Time: 6 mins
Dog owners might disagree, but as far as evolutionary biologists are concerned, all dogs are just dogs. It may seem odd that Canis (lupus) familiaris extends from rabbit-sized Chihuahuas to Great Danes which can be almost the size of a small pony, whereas seemingly much smaller differences place many animals into separate species or sub-species.