This is Morgan, who is always ready to jump into any car w me, and especially likes the 911 where he can either sit on the back shelf against the warm engine, or curl up on the passenger seat.
I do get concerned about emergency stops, ie a panic stop, and a flying dog (in wagons or the p car; i investigated a dog seatbelt, but it seemed designed to break their necks and chest).
Also, as a strategy in a recent thunderstorm...I visited a friend about 40 miles away, keeping it revved high, and the original rarely used by me Blaupunkt tape cassette with a disc player wired in through the tape opening at full blast. The combination of engine noise and stereolab, kept my hound happy.