An invisible fence can be installed underground, or a transmitter set to allow a certain radius from a central point. The invisible fence can be set at the border of your property or yard site, or wherever you want your dog contained. The dog wears a radio collar that receives transmissions from a radio transmitter that is signaled by the invisible fence. The collar first produces an audible signal to the dog as he approaches the boundary of the invisible fence ,to let the dog know he is at approaching the boundary. If the dog proceeds to the boundary of the invisible fence he will receive a signal stimulus correction as he crosses the invisible fence line. The stimulus correction is usually similar to a static shock, and serves to deter the dog from crossing the invisible fence line, thus giving the dog a boundary and keeping the dog safely in a contained area.
However, simply turning your dog out to learn how the invisible fence works by trial and error will result in many incidences of negative reinforcement, which can be frightening and confusing to your dog, and may take several unnecessary incidents in order for your dog to learn the boundaries of their invisible fence and stay contained within it. Responsible use of an invisible fence includes teaching your dog what the boundaries of the invisible fence are, and how to understand radio signals warning of impending corrective stimulus so they can react appropriately to avoid triggering the fence.
Have lots of treats and toys to reward and reinforce appropriate containment behaviors. Do not leave your dog unattended in an invisible fence during training, so as not to result in unnecessary negative stimuli corrections that can confuse your dog or allow successful attempts at evading the invisible fence.