The only time I tap Timber on the nose is when she's holding something she's not supposed to and won't let go. She knows the "drop" command, but chooses not to use it because "this is a new interesting toy and I don't want to drop it." The only thing she won't ever drop, even with a tap on the nose are Pedro's tennis balls. Poor guy. I've tried pushing the ball inside her mouth because that's supposed to make her repel and let go, but it doesn't work. I've tried distracting her, I've tried everything, but she won't let go. She isn't territorial or toy aggressive by any means. She just won't let go, and a tap on the nose with my index and middle finger solve it.