My dog came back from the groomer yesterday, and he has been acting weird. He won't stand for very long, and when he does his tail is tucked and he kind of squats. He sits as often as possible and won't walk more than a few steps without hurriedly sitting down. He doesn't like to be held, but now he is trying to jump into my arms. He did this last time too, but it's worse this time. I don't know what to do. He is definitely in pain.