Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Complete Waste of Money; Utterly Useless

Our (neutered) cat, who had been happy, well-adjusted and never destructive recently started marking/spraying in our new home. He is still affectionate and playful and hasn't seemed stressed at all. However, the spraying continued. We got this product based on the claims that it reduced or eliminated spraying. DON'T BELIEVE A WORD OF IT! The spraying has actually increased dramatically while using this product including five times just this morning while prior to using the product it was once maybe every three or four days. It seems this product has worked for some to calm their cats but I can tell you that the claims of controlling spraying seem to be completely unfounded. I would NEVER consider purchasing this product again.