One way to confirm a dog’s identity is to check the microchip but before the microchip was first used, dogs were identified by their nose prints. This is because a dog’s nose shows a unique pattern, just like a human’s fingerprints do. Nose printing is described as a painless and non-invasive method for checking the identity of a dog.
The Canadian Kennel Club has used dog nose printing as a form of identification since 1938. However, it requires the owner of the dog to use food colouring instead of ink so that they can put the nose print onto paper. The owner had to send the nose print to be registered to their dog. Nose printing is still used today, but a microchip is the more common method for identification.