Instruct: Classify Amazon reviews into positive or negative sentiment
Query: leaves pet feeling greasy, doesn't last long

This product left my dog's fur feeling thick and greasy. It killed the fleas when sprayed directly on them but the next day he was covered in them again. I again bathed him and sprayed with this product, the next day he was thoroughly infested with fleas. We had sprayed his bedding, our carpets and couches but the product never made the flea situation any better. I would not buy this product again.