My dog Mathan, a 5 year old toy poodle, also does this....I can't remember when the behavior started, but I'm pretty sure it's a nervous thing, since he does it a lot more when he's nervous (lots of things going on at once, new people, when he doesn't know what to do with himself). It could be the same kind of thing going on with your dog.....usually, if I pay him a little attention, he stops licking.
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