Several of the most highly-rated pet tracking devices include the RoamEO by Petronix, the Tagg Pet Tracker, and the Astro 320 bundle or GTU 10 by Garmin. The best pet-tracking devices typically range in the $100-$200 price range, as of 2015.
Pet trackers work by including a GPS unit in the pet's collar, The owner's headset, which also contains a GPS and compass, receives location signals and communicates through radio. However, some can communicate directly with the pet owner's cellphone to allow less need for additional gadgets. Some devices require extra monthly service fees or additional fees for tracking of other things like cars or children.