Even if your dog wears a GPS tracker, Dr. Jessica Pritchard, a clinical assistant professor at the University of Wisconsin-Madison School of Veterinary Medicine, says microchipping is still essential. Your dog’s collar could become detached, or they may wander into an area without a signal. Pritchard, who previously used a tracker with her dogs, says that microchipping and GPS trackers work together like locking your doors and installing a home security system.