Young dogs do this too. My 4 year old Cocker Spaniel will dig the area rugs and mats that I have scattered around the house. She will also dig the carpet in the back seat of G-Man's truck. Once she'd decided that she's not going to make it all the way through to China this time, she stops and goes back to what she was doing before.
If you're green, you're growing...if you're ripe, you're rotting!
I try to greet the world like my pets do...boundless enthusiasm, intense curiosity and no concept of yesterday and tomorrow.