Snuffles had a neck injury last October was why I was curious. A couple of days before he showed major signs of pain, he stumbled while running after a bike on the other side of the dog park fence and fell on his face. So I am assuming that was the trigger. I was lucky, a week of Deramaxx , a few days of Tramadol and one chiropractic treatment and no issues since. Hope Henry has a speedy recovery with no lasting effects.Leonard, Henry tweaked it while pulling a boat in. It was a windy day and he turned his head just the right way to put a kink in his neck. And anything with the neck can be very painful so we are on some rest for right now. He's getting massages, chiropractic work and accunpuncture on a weekly basis. If only I can have that done for myself!!!! Thanks for asking!