Instruct: Classify Amazon reviews into positive or negative sentiment
Query: DO NOT BUY!!!! SAFETY ISSUES!!!

After only 2 DAYS, just 2, I noticed that all the the fur under the collar was GONE! Its supposed to stay on for 7 months and just two days in there was only skin left. I looked up the same product and it seems like a LOT of pet owners have seen negative effects from using this and other Hartz products. DO NOT BUY THEM.