I am so sorry to hear about your dog. And hope that it all turns out well.
I lost a boxer hit by a car and the people did not even stop. After x-rays he had to be put down. Boy I cried and cried. My knew dog has never been loose because I'm scared of it happening again.
I know how you feel and will be checking here to see if your dog is ok. Will pray for you and your doggie.