We recently acquired a one-year-old female shiz tzu. She has, or has developed, severe sepration anxiety - to the point she bloodies her mouth and paws if left in a crate for even a short period. She panics wherever and whenever left alone. A vet has prescribed a mild tranquilizer but we hate to use it every time we leave the house for an hour to leave her in the car while eating in a restaurant. We need help.