Other methods for identifying pets include GPS tracking devices, radio frequency identification devices, and permanent tattoos. (americanshihtzuclub.org)
This could replace radio frequency identification tags to allow objects to be identified and tracked at long range. (newscientist.com)
When a lost pet is found, animal shelters and veterinary clinics can scan the pet with a specific type of scanner (using radio frequency identification technology), which will bring up a unique number that is matched in a database to an owner's contact information. (guelphhumane.ca)