My pig has sometimes been doing this thing where he kind of slightly jerks his head forward, but there is no sound. If he were to be coughing, I feel like that would be the movement for it, but like I said, there's no sound to it, or any other symptom of a URI. I kind of feel like I'm worrying too much, as he is my first pig. However, I also understand how little time you really have once symptoms are fully evident. Another thing, he really only does it in his pigloo, and even then it seems like it happens more when he appears to be "scared stiff". No movement other than the head-jerk. I'm sure a lot of you have seen enough of me on this particular board, but do know that I appreciate your advice. I'm just a concerned new mother.