When I come home from my daily outings, I always get profoundly investigated by my dog's schnoz. And I often wonder what information he gathers. After weeks of observation, I have noticed something very interesting. He can determine where I've been, who I've been with, and how frequently I see them. He can even identify a particular scent of the culprit's home indicated by his signature wiggle and small woof of recognition. Familiar odours don't hold his interest for long and he quickly...