Well, I think he's onto me. The evidence is getting smaller.... bit by bit he's disposing of the back door mat!
He's a funny kid. If I've been out or away for a while when I go outside again he will stand on his back legs, gently put his front legs on my chest, rest his head in my cleavage and when I look down at him he's sniffing my breath to see what I've been eating! I've noticed a friend's border collie do the same thing.