In all my years of flying, I've NEVER seen a drug dog. EVER. The possibility of a drug dog just walking up to you and start barking is pretty slim to nil. Just wrap it up well enough in your pocket (Or better yet, shave the interior of one of your legs and tape it next to your crotch) and then just carry your carryon bag to the bathroom with you and transfer it over to your bag and board onto the flight, safe.