He's a puppy...that's what they do! The game of "steal-something-I-shouldn't-have" is LOADS of fun...why stop it? It's play.
We don't make a big deal if he takes something like a cell phone or the tv remote, we just try to remain calm-they sense your
frenziedness-and to lure him from it with something else that he prefers.
(yes, my cellphone has tooth-marks on it and so does the tv remote)