4. Caffeine or products containing caffeine
The effect is quite similar to chocolate. Caffeine also works as a stimulator and makes the heartbeat go very fast. So, avoid feeding them coffee, aerated drinks, and tea altogether.
5. Bread Dough
This is a very dangerous food for your Shih Tzu or any other dog. Make sure that they are not eating this at all. Even a small amount of bread dough can poison your pet. Bread dough rises inside the stomach and it produces alcohol. This is the reason for poisoning.
The result can be vomiting, abdominal pain and even depression due to sickness.