Instruct: Classify a review into positive or negative sentiment.
Query: Naturvet GrassSaver

Doesn't work, period. According to the product, you can contact the manufacturer for questions or if it isn't working as described. Utilized this product on both of our dogs, one medium one small. Worked for neither, even after following the directions to the T. Beware, the manufacturer will not respond to emails or letters concerning the effectiveness of this product. Was hoping for another bottle so I could give it another chance but now I just want my money back. Don't get your hopes up or wate your hard-earned money on this product!!! Buyer beware, you've been warned.