[MidnightUnicorn]

I agree -- I suspect it's worms or anal glands.

I've expressed Tatiana anal glands (when she was dragging her bottom, and her anal glands were swollen). It's not difficult, but it's messy.

These days, I haven't had to express her glands. She no longer drags her bottom along the floor. I think it's because I improved her diet for her. In the past, I added yogurt to her food, and it softened her stools a lot (almost watery). I suspected the yogurt upset her tummy, and gave her loose stools. In turn, her glands were not naturally expressed when she pooped (because her stools were too soft). When I omitted the yogurt in her food (and gave her calcium powder instead), her stools became firm. She stopped dragging her bottom. I think her glands were naturally expressed by the firm stools.

Sorry if this post is too long. Just want to share in case it helps.