I bought the anti bark collar for my dog, and the effects and results were amazing. I have a German Shepherd X so his bark was loud and annoying, he would bark constantly while we went out or bark at any noise at the front door. After only a few weeks he not only stopped barking erratically but it also calmed down his general behaviour. He now barks only when there is a real need to and is even calm when people come to the front door. The barking before used to heighten his excitement levels making him snappy as well, the change in him is amazing as it not only stopped his irrational behaviour but I know he is a happier dog as he's using his nose ears and eyes the way he should and no yelling from us. Highly recommend the product.