Thank you all for your replies. I can tell you that a car was not involved. The only time this dog has been in or even near a car was when she was rushed to Cornell. When I went to see this dog I just couldn't believe my eyes. The vet did tell the owner that it had something to do with the circulation, that is why the skin died like that. This is just a sad story for the dog, the owner and for the young man who did this.