I have found that if I put a leash on my ferret(with a harness) that they can be loose in the car. The leash makes it so you can get them if they are trying to sneak under the seats. The one thing you have to watch out for is that they don't climb down by the drivers feet.... this makes heavy breaking gruesome. Just bring plenty of water, a warm lap and lots of patience. I had a rabbit. I had a ferret. Ferret made rabbit psychotic. I got rid of the rabbit. Ferret smiled. Now has sites set on the dog. Dog is concerned. [Posted in FML issue 1443]