I saw something today that kind of worries me. I had just come home a while ago and I took Dax outside. I was standing waiting for him to do what he had to do, and I looked down at him and his mouth was open slightly and kind of dripping. I said his name and he looked up at me and the bottom of his mouth was trembling. It only lasted a few seconds and he was back to normal, but I've seen him do this once before (we were inside the house the first time), so I wanted to see if anyone else had experienced this and if it's something I should worry about.