Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't buy for small dogs!

Even after several adjustments and trimming the collar down significantly, this anti-bark dog collar was also an "anti-working" dog collar for our small shi-tzu/poodle mix. After finally getting the fit we wanted, we (owners, not the dog) needed to blow directly into the mechanism to release the bark repellent. I would not recommend this product, especially for small dogs (<20lbs).