My pup would go in the road and try to flag a car, any car, down to see if they would give her a ride. Seriously. Couldn't stop her. Shock collar didn't help. Turned up to 11 and she would still suck up the pain and try to stop traffic. Finally a Chevy sedan hit her so hard she bent the bumper, then went under both the front and rear tires. She got up, trotted back to me. The next day the vet x-ray showed 3 severe broken ribs, 2 more cracked. They thought I made up the story because she was all bouncy and fine in the waiting room. Except she had a clear layer of tire rubber across her chest. A couple small areas on her head and 1 leg are missing for, other than that she is fine. No pain meds. Not even a baby aspirin. But at least she stays a good 10 feet from the road now.