I've never heard of this and can't find anything online about it. My 2 cats a couple weeks ago started cleaning each other constantly. It's cute and they love each other but now they won't clean themselves. So I'm using pet wipes to get the matting stuff out of their hair then brushing them. Also, neither of them have had hairballs in the past 2 or 3 wks since this has happened too. But I would really like them to clean themselves again. Anyone have any clue as to what's going on?