Think of Tagg as Find My iPhone for your dog. The squarish gadget, which attaches to your pooch’s collar, packs GPS and other communications technologies. If Fido bolts out of a predetermined area you specify, you get a text message altering you that he’s gone, and can use the web or a mobile app to track him down on a map. Tagg’s $99.99 price includes the collar doohickey and a base station; you also pay $7.95 a month for the required service.
Link: Tagg Pet Tracker