Some dogs just lick obsessively. Personally, I think it's gross and don't allow it; animals typically pick up right quick on "lots of licking = no more attention/cuddles." None of my three girls lick me obsessively anymore - my small dog still does to other people but the best I can do is tell them not to allow it and to be consistent about it; my medium dog does it to others sometimes, same thing I just have to remind them to remind her it's unacceptable; my brother's dog still forgets sometimes and tries to lick me, but I don't see her often so she's still learning that I don't like or accept her licking me and if she does I won't give her attention (dogs know when somebody doesn't like them, she knows I'm not a big fan of her, she's still trying to win me over, thus she's putty in my hands [when she's not being a brick-headed dumbass])