Yes but never for long, like if I have Nebo with me and I have to run in and pay for gas or something. Of course I would never leave him there when it's hot outside or anything. He's VERY good in the car, it doesn't stress him out at all, he just goes to sleep. But I'm paranoid about people trying to steal him so I would never leave him alone for long. I've parked the car right outside of a window of a restaurant and sat at a table to eat before, if I can see him the whole time I don't see a problem.
Bookmarks