I was just outside with him and all of the sudden his head shot over towards the back of the house and up. (We are surrounded by forest)
He did a short growl and then started barking like mad. For the life of me, I couldn't see what in the world he was barking at.
Within a minute I knew what it was. 2 deer who really blended in well with the brown trees waaaaay back there.
Good eye boy!