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Just like how others have mentioned, it could perhaps be that your dog is extremely affectionate. Most dogs show their affection by either cuddling or licking their owners. But it could also be a sign that your dog has some sort of OCD (to some extent). My dog had OCD during his later ages. His OCD wasn't necessarily about keeping things clean and proper. He would lick everything around him to rid of any smell that he doesn't find attractive. Sometimes human oils aren't really that attractive to animals. We touch A LOT of things and when you go near them, they would rather have their own smell than your own on you.
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