ANSWER - Tricky one. I think probably I'd go with something to calm the dog down. If you can get a bit of its hair, try sealing it into a small plastic bag with some chamomile and placing into the freezer. Freezing the essence of the dog should slow it down and hopefully make it less stressed and agitated. In conjunction with the calming properties of the chamomile, you should see the dog happier and more content.
I'd also suggest that it may well be worth experimenting with playing different types of music outside the window to the dog. Classical music can have a very calming effect on animals, particularly anything by Mozart. You may feel a bit silly pointing your speakers out the window, but hey if it works, peace is always worth looking a little silly for.
I'd be very interested to know how this one turns out. Keep me posted!
Image http://www.sxc.hu/browse.phtml?f=view&id=1420563 (Leesa)