The Canadian Kennel Club has been accepting dog nose prints as proof of identity since 1938.
‘Just as humans can be identified by their fingerprints, dogs can be identified by their nose prints. Yes, you read that correctly, a dogs nose print is unique to that dog, just as no two human fingerprints are the same. If you look closely at a dog’s nose, you will see lines forming patterns, just like fingerprints. This raises the question – Can nose prints be used to accurately identify a dog if found without a collar or tags?’ (All Pet News).
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