Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It worked TOO well...

We used this device with our 15 year old chihuahua mix who had taken up a shrill bark that sounded like she was hooked up to a metronome. When our cleaning people came, she would bark continually while they worked AND for 45 minutes after they left. This gadget worked quite well. She flew up the stairs like a bat out of hell as soon as it went off! However, after using it for about a month, she became so neurotic about it that she wouldn't even come downstairs to eat. We gave up. We missed our little princess.Our second dog, a peaceful and quiet Italian greyhound - Boston terrier mix, remained his calm, unruffled self throughout this ordeal. Armageddon would not disturb him as long as he is under his blankie!