Scooting - EXACTLY ! I couldn't think what to call it....anyway, I was thinking maybe worms but am seeing no outward signs...can cats have worms and humans not be able to see them...maybe I should bring a stool sample to the vet just in case. Anyway, she seems to do it after grooming and not necessarily after using the litter box but sometimes perhaps. I think I've maybe noticed her doing it once a day ...so not a lot but enough that I noticed it...