Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This thing works

I have a 1.5 year old pit bull. She's sweet but dang, pulls like gangbusters on her leash. I had her on a gentle leader---which started shredding almost immediately. Pit jaws are so square, the leader is not a good fit. IMO. Anyway, I needed a solution and did not want a metal choke chain. Viola! Enter the StarMark collar. She still pulls but I have much more control and she has gotten better walking and running on the leash. I'm not saying this is for everyone, I realize there are some bigger dogs out there (mine is about 55 lbs) for whom this might not be enough. But for my situation, it worked.