Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Didn't work & nearly gave me an asthma attack

I bought this collar for a bigger dog (part bulldog, part boxer), who barks while family is trying to watch tv. The collar did work but it ran out of spray after only 5 or 6 barks and then you have to refill it which becomes a pain. The collar itself is made poorly & needs to be readjusted often. In addition to that the dog quickly learned not only how to see if the collar was empty but also learned how to use the collar to spray the other dogs who were not misbehaving and this is not a particularly smart dog. The collar also sometimes sprays if there is any noise including growls or just heavy breathing or one of the other dogs barks too close to the collar which seems unfair. It did seem to curb the problem somewhat but certainly doesn't eliminate it, in addition the smell inside would be quite dangerous to anyone prone to respiratory problems. I would not recommend it.