Instruct: Classify Amazon reviews into positive or negative sentiment
Query: useless collar

I bought this collar for my small dog, she's only 6 lbs, the collar is so unflexible because its all plastic the anti bark prongs end up on the back of her neck everytime she shakes her head. I cant make it any tighter or she would for sure stop barking, as well as breathing...so I'm out 70 bucks and I still have a non stop barking dog.