Never underestimate the power of a best friend. One that will be there when all the others have fallen away; one that will love you even when your breath is bad – the kind of friend that gives you their heart from the moment you walk in the door, and regardless of your demanding nature finds time to listen to your stories. Mental health has been attributed to these better than average companions, as well as physical healing and general well-being in the elderly. So what is it about them that makes them such perfect comrades, such loving soul-mates day in and day out? They have something that humans lack. They have focus and nothing will tear them away from it. They know that their purpose is to love the one they call master, and they do it with all their hearts no matter how long the day, or how hard the road.