I've posted about my shih tzu before. My other two dogs are mutts and this particular dog is the only full breed dog we've rescued. I have NO clue about small dogs or their normal/breed habits. I've found out that shih tzu's are known biters. But are they prone to vomitting frequently? We haven't changed their diets, they have plenty of water all the time, and they get frequent exercise. I have no clue what would make our little guy vomit somewhat frequently (it's happened twice in the last week). Any ideas?