I go with the nose. My dogs know when someone is walking their dog around our cul-de-sac and they start barking. The dogs aren't making any noise and my dogs cannot see them there so the only other way they would know is by the scent. Same thing when someone comes to the door. My pups start barking, but after sniffing at the door, they stop if it's someone they know. If it's a stranger, they keep barking. |