The dog has gone off on his own and you don't know where he is. You might not even know that he's wandered off. You might not be aware that he has gotten hit by a car.
What did our dog Joey do after he was hit by the car? He eluded everybody who was trying to HELP him, and walked home, several blocks away. And walked back down our driveway to the gate, and sat, and waited.
He didn't cry, he didn't lay down. He just sat by the gate. And waited. For me.
People have told me that a dog who knows he's going to die will find an isolated place and just stay there. I don't know about that. I do know that our dog was very wounded, and that he came home, and waited.
And this is why it was so difficult for me to know, on my own, what had happened to our dog.
Another dog I know of (through the blog) was hit by a truck; his owners thought he was dead and they started digging a hole for his final resting place. Suddenly, he started moving.
It was a miracle.
Just last month, ten months after Joey was hit by the car, when I was walking Joey on a rainy day, an enthusiastic City worker stopped me and said, "Is this the dog who was hit by the car?" It turns out this was Eddie, the person who had tried to follow Joey but who'd lost him in the underbrush, and who notified the City that a dog had been hit!