Here are a couple articles that might help. Good luck!
Mine often try to "dig" on my bed - cracks me up.
I would say teaching Leave It.
thanks for the articles!
the hard part is that he only does it when i'm not there (with the carpet) or a bit away! he knows 'knock it off,' 'leave it' & 'drop it' and listens right away when i'm giving him the command. he's just a little bugger about it when i'm not there
*sigh* smart dogs and their constant antics..