PetSafe® In-Ground Fence™ pet containment systems provide your pet with freedom and safety while spending a fraction of the cost of traditional fencing. It s easy to install reliable and safe. With proper training it is a very effective way to keep your dog safely in your yard. It works through the lightweight collar your dog wears. The collar picks up the signal from the buried wire and alerts your pet he has reached the boundary. Trust PetSafe® to help keep your pet healthy safe and happy.