It apparently (hopefully?) was just a little bit of poo, which she let me gently excrete - she NEVER lets me touch her back there, so I knew I was doing the right thing as she was fine with me handling her. I've never done this before, but somehow I instinctively knew what to do - after checking a few websites on how to do it, apparently I did it right and she's fine now. I too had visions of $$ flying out of my wallet for a trip to the vet. I am keeping a close eye on her just in case.