I haven't really been aware of any noises jack has made before, but tonight I have heard 3 different ones. He did a little grunt when I was brushing him, probably when I was too rough for his liking. He then made grunting noises when he was eating his celery - this was a different sound to earlier. At the moment, he is laid next to my feet, and I can hear his teeth grinding or chattering!! Can anyone tell me what all this means please?