We recommend Save This Life Microchip as a permanent identification system. Watch this video: https://youtu.be/sG0eHkBqO5M
How it works:
A veterinarian simply injects a tiny microchip about the size of a grain of rice (12mm) beneath the surface of your pet's skin between the shoulder blades. The process is similar to a routine shot and takes only a few seconds. No anesthetic is required and it will last throughout the life of your pet. The microchip is read by passing a scanner over the pet's shoulder blades. The scanner reads the chip and displays the pets' unique code. If your pet gets lost and is taken to an animal shelter or veterinarian, they will scan the pet and retrieve the identification number.
Save This Life has patented a way to use Google to help you find your lost pet! Each Save This Life microchip number is searchable in Google. When someone finds a pet and Googles the microchip number, they can privately contact the pet owner through text and email. The pet owner receives a GPS map of where the person who found their pet is located!