hmmm...I do not have an answer but I also have a licker! It is my Dylan and it began fairly recently - the last several months. I think it is something good because he has also become more affectionate and allowed a few belly rubs. He will give me maybe 4 or five little licks and then snuggle down and repeat this maybe 2 or three times a day - so not as often as your Bo. I think they are kisses