In my opinion, If your pet is lost, a microchip won't alert you or show you where she is. So a GPS personal tracker for dog is important. With GPS tracking, you can find your dog on map now. See more details: http://www.meitrack.net/mt90/#
Yes. It is commonly called a microchip. Cats and Dogs usually get them. They are usually placed at near the back of the animals neck/ upper back. All it is a small chip injected into the animals skin. If you ever lose your pet, you would go to the place where you got it done/ your current vet that knows about is and they would look it up.
No, a microchip is not a tracking device. It is more like a tag placed inside them with all their owners information so if every lost or stolen and get takin to a vet or shelter they will be able to contact you.