Take a close look at your cat or dog’s nose (a magnifying glass would probably be helpful), and you’ll see little bumps and ridges. Just like humans have fingerprints, cats and dogs have nose prints. These nose prints are unique to the animal, and can be used for identification.
Another way to identify dogs is through a microchip implanted in the dog. But it goes without saying that many pet owners wouldn’t consider this as an option. Furthermore, the chips can dislodge or malfunction, hence become useless. Natural works best and collecting nose prints is as painless as having your fingerprints taken.
There’s a company in the US going by the name ID Systems Integrators and these guys collect your dog’s nose prints and store the details in a database. When your pet gets lost some day, all you got to do is give them a call and they’ll find him/her for you.