We will be traveling, a 12 hour drive, and Keegan is a little high strung. She pants while in the car. She sits against the seat, wont face the window and at times tries to get behind Sedona. Has anyone used the thunder shirt for traveling and if so how did it work? She doesn't whine or pace or bark, just seems uncomfortable. Yes we have taken her in the car many times. Any advice would be greatly appreciated. Thanks!