We have this little "game" at our house. Bailey is a scavenger- she will chew on anything left on the floor. Most of the time, it is appropriate things like bully sticks. But, every once and a while, she will find a pen or a pen cap or something she shouldn't be chewing. When I spot her I tell her "trade" and she drops what she has and I give her a treat. Tia is usually close by so she gets one to. Well, this last week, whenever Bailey starts to chew something she shouldn't, Tia will run up to me and start barking her head off. Now she won't do this when its something Bailey should chew, only for things she shouldn't. Its like" Mommy, Bailey's being bad!!!"