Instruct: Classify a given review into positive or negative sentiment.
Query: Amazing

We had tried everything to keep Wally from being such a barkaholic, to no avail. A friend of ours got the Premier Anti Bark Collar for her dog and was pleased with the results. She let me borrow it for an afternoon and I couldn't believe what happened! Wally needed about 3 sprays before he got the idea that his barking was causing it. He was quiet the rest of the time he had it on!!! Even with 2 other dogs visiting!I couldn't order it fast enough! Now I can actually put the collar on him and often times I don't even turn it on. He understands that he must be quiet when the collar is on him, and he is!! One thing I really like about it is that the citronella is sprayed right in front of him , not in his face. Wally definitely doesn't like it, but it is not harming him in any way.