E-collars in the hands of an untrained user is like handing a razor blade to a monkey, it can cause more harm than good. They are a big part of how we train, they are not for everything but do serve a useful role. We use them for the come command and heeling, to stop a creeping pointer and other behaviors we see in individual dogs that we are trying to modify. It is important to understand that a dog must be trained to understand what you are asking from them when you use one. The training process should be a combination of voice commands over layed with use of the collar. If you haven't used one before it would be a very good idea to read up on how they are used ( there are several good books out on it) or take lesson from a professional trainer (we can help with that)