How awful. Hope your dog will be okay. Please everybody, keep them crated or harnessed in the car. It is so much safer. If you have to let them out, you can easily open the car door, wait until it is safe out there, open the crate and leash them. Teach them not to jump out until they are being released.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015