Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Wonderful!

This exact same product at my local Petco is $129.00! I love this small, citronella bark collar. My 12 year old Cairn terrier is a barker and after awhile, the neighbors have had enough! (He even barks at the jet planes when they fly overhead, even if he is in the house!) Great and effective.