Well Jack just had vaccines today and 3 weeks ago he got his last distemper shots. He yelped and cried today when he got his bordetella injection but not since then. I haven't heard of this and Jack has never exhibited this behavior. If he continues tomorrow, you may want to get him to the vet and let them check him out. It's always better to be safe than sorry. Good luck with your new little one. Keep us updated!