Why is this product so amazing? For one thing it "tones down" an exuberant dog and helps him concentrate on the matters at hand. The Q-Calmer places a weight around the dog's neck that while far from being uncomfortable exerts enough force to tell the dog to "cool it." You will be amazed at the difference. Now we do not recommend that the Q-Calmer be left on your pet indefinitely: like all training aids it is a tool to help your dog learn.