When we got our dog years ago we cage trained her. She has a large cage that she sleeps in. That cage goes into the SUV and she rides in it, not loose in the car. Over the years she has come to think of the cage as a security house. So when it starts to storm she goes to her cage. if the door is shut she starts to whine and gets real nervous till you open it for her. She isn't a little dog either she's a large golden retriever.