The canine world of today is highly diverse in that it may be quite impossible for some of us to grasp the fact that all dogs have one and the same wild wolf ancestors. (notinthedoghouse.com)
This is even higher for dogs, whose wolf ancestors never drank dairy milk. (petconsider.com)
You're hauling away a sophisticated marking tool, unique to your dog, which is part of a communication system that took thousands of years to evolve in your pet's distant wolf ancestors. (fox19.com)