Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great Idea

This is a great idea for a collar. I loved it when I first received it. The next day I noticed the collar was starting to fray quite a bit, which continued to get worse. I finally had to throw it out after about a week. I'm not sure if this was a fluke or not. I have an English Mastiff, who is a large lazy dog.