Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Nice idea but not ready for large dogs.

The concept of the collier works fine except its not ready for the power of a large dog. Our German Shepherd broke the nose strap almost the first day. So if you have a medium dog or maybe a dog that doesnt pull its for you as it does work. But not for dogs that can pull you down the street as this simple fabric cannot hold the power of our dog.