You need to determine between your dog just licking every once in a while to be friendly
or obsessive licking where it is just a compulsive behavior like thumb sucking in a child
If you think it might be compulsive it's usually because they aren't stimulated enough and the licking is a way for them to calm themselves
try to get him tuckered out
go for long walks
take him to the dog park
play fetch
and see if the licking diminishes
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