For livestock producers who use herding or guard dogs, a GPS Fence Dog Collar with its companion mobile app provides for invisible fence-type containment of the animal (via collar-emitted vibrations), sends alerts when it "tests" the containment area's pre-set boundaries, and reveals the dog's precise location. This GPS collar-and app system utilizes machine learning for fence and tracking accuracy. Some systems rely on cellular networks, others on a subscription-fee-based charging cradle/gateway within a given radius.