As the process of finding missing pets goes “high tech” with GPS collars, QR code tags, etc., keep in mind that although these can be of benefit, they can also be removed. We still recommend a microchip because they are a permanent means of identifying your pet (and it’s a very effective way to get your pet back, assuming you keep your info up to date in the registry). Use a collar and ID tag for instant identification of a lost pet, and a microchip to identify pets in case the collar/ID is lost or removed.
http://www.abc2news.com/dpp/lifestyle/finding-missing-pets-goes-high-tech