I really did not want to have to use this on my dog, however, since she is a runner, we just had to try it as a way to keep her safe inside our house.. Well, guess what? She got shocked one time and has not tried to run out the front door in over 5 weeks. One day she got close, so I put the collar back on her, and she heard the signal and backed away from the door. This product works like a charm and I'm grateful to have a product that keeps my dog safely inside the house.