The Guardian is a portable invisible shield system that trains dogs to stay away from the animals and areas that you choose. Dogs can provide protection on farms and at home, but without the proper training they can also end up killing chickens, harassing other pets, and breaking into food stores. This system helps train dogs to avoid the flock and other restricted areas using audible alarms and small shocks. It is easy to use—the lightweight transmitters can be slipped into low-profile vests on your chickens or placed in locations you want to protect, while the receiver collar on the dog activates a set of warnings if the dog gets too close. This innovative product can also be applied to children, cats, other dogs, and whatever else you need to protect.