Instruct: Classify the given review into positive or negative sentiment.
Query: Great idea, but doesn't work for us

We have a medium sized black lab (60 lbs) and this collar doesn't work in a practical way for us. I'm only 5'5" tall, so that isn't the issue. It will be worse for anyone taller. I bet it would work for a taller dog, though. The "leash" only extends a couple inches, so I really have to bend over in order to "walk" my dog with it. It also really pulls on my dog's neck so she does that coughing/choking thing. I tried making it looser to give me another inch, but then it just slips off her neck.