The Tagg Pet Tracker ($200) is like a house arrest ankle bracelet for your pooch. It lets you track your pet's location using a computer or a smartphone, thanks to the on-board GPS tracking system. The Tagg can send a text when your dog leaves the safety of your Tagg zone or geofence or an email when it needs recharging. The Tagg is lightweight, waterproof and can be worn at all times.