Satellites for SafetyEvery dog owner's nightmare is a missing pooch. When that happens, stapling signs on neighborhood telephone poles (“Have You Seen My Dog?”) doesn’t work as well as real-time satellite tracking on a map. That’s what GPS dog collars enable you to do, and much more. There are many brands to choose from. One example is the Retrieva, which not only gives you tracking but alerts you if your dog wanders beyond a specified radius. It even provides a historical record of where your dog went and when.