Hi all, only just come accross this site and wondered if anyone can help. I have a 19 month old Shih Tzu and last night just before retiring to bed he started growling for no apparent reason. We let him outside where he started to eat grass but like a gremlin possessed, literally. For the next five hours he paced up and down constantly, growling, licking the wall, outside attacking the grass, then back in snapping and growling if you went near him. He seemed like a completely different dog almost as though he was possessed. He is usually such a mild mannered dog. He has been sleeping most of the day and very quiet now. He was sick about an hour ago. He has quite a sensitive stomach, so this isnt too unusual. This is yhe second time this has happened. First time was about three to four months ago. I'm confused and worried. Can anyone help?