Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Didn't work on my papillon. :(

The collar is to heavy to stay in place (no matter how tight) on my dog. It only works 1 out of 5 barks and he didn't stop barking. However, the company is AWESOME. I called them and they sent me a replacement collar immediately. Unfortunately the 2nd collar worked only as good as the first one. I can see if it fit his neck better that it would work. It just doesn't work on my dog.