Abstract: The Sensor Collar System provides a pet tracking system comprising an electronic transponder which incorporates Global Positioning System (GPS) technology which monitors the specific whereabouts of a pet as soon as it leaves the house. Configured to mount onto any pet's collar, this device features an internally contained, high-tech computer chip. Encased in a durable plastic casing, this chip is equipped with a tiny antenna which sends signals to the designated GPS satellite. The Sensor Collar System also features a handheld receiver, equipped with a screen that utilizes LEDs (light emitting diodes) or in another embodiment, an LCD (Liquid Crystal Display) to graphically display a pet's whereabouts. This makes it possible to pinpoint the animal's location anywhere on earth. The receiver is powered using a standard alkaline battery source or a rechargeable battery source such as lithium, nickel-cadmium or nickel-metal hydride.