Instruct: Classify Amazon reviews into positive or negative sentiment
Query: rooster500

Hoped it would work on a small dog (12 lbs). It sounded good based on the reviews and online manual but it only works 10% of the time. The unit itself is too big and easily slides to the side of the neck and so it won't get activated when the dog barks because it is not directly on the animal's voice box. Instructions emphasize that the contact points have to touch the skin but the prongs are too long so it doesn't fit right. The unit itself is literally bolted onto the strap. Instructions say to cut the excess strap to fit the dog. Once you cut the strap you can't move the unit up or down the strap so it's awkward placing it on the animal. It probably works better on a bigger dog but definitely not on a small one.