Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dangerous Side Effects

My Shih tzu almost died after using this product. Before you put this on your pet do some research. You will find that many many dogs have had serious allergic side effects from this product and many have died. We still do not know if my Shih tzu is going to live or not. PLEASE DO YOUR RESEARCH BEFORE YOU BUY THIS PRODUCT