Your Papillon could have a worm infestation. When did you last deworm your Papi?- Your Papillon can express his anal glands, by scooting over rather coarse surfaces, as asphalt, concrete, carpet.....If he does this occasionally once or twice, and he stops, he most likely has the job well done. But if he continues to do so, then you must check his anal glands, make sure that they are not compacted.
Read here about one of my previous articles about Anal Sac (Infection)