You would ask yourself! How?
It’s their Nose. If you look closely at a dog’s nose, you will see lines forming patterns, just like fingerprints. It is quite useful on identifying lost dogs.
But most countries don’t use this method.
A dog’s paw print may look pretty generic but their nose print is actually as unique as a human fingerprint. Their combination of ridges and creases is so distinct it can actually be used to identify them.
The general idea is that nose printing is a more reliable way of matching identity, as dog tags can easily be lost or even stolen.
Good luck getting them to stick their nose in a pad of ink without sneezing though.