We micro chip all our puppies, and have since the day we began in 1998. Microchips enable any puppy to be traced back to us, as the one that implanted the chip. As of 2 years ago we began registering the chip for our clients with AKC CAR www.akccar.org/about/profile.cfm the largest national, not for profit database registry. This enables shelters or vet clinics to find the lost parents very quickly, 24/7. We also enroll you and your puppy in "Lost My Pet" recovery. Take a look at: www.lostmypet.com/benefits.html. This is a huge safety feature for you and your new puppy. The other three sources should microchip and register all puppies and dogs as we do. Side Note: If all sources would microchip as we do we could prove where shelter dogs are coming from.