Re-posting here from "Pets" for traffic:
We've had a rescue cat for a couple of years. She was about 8 when we got her and half bald as they'd had to shave off quite substantial patches of fur as it was so matted.
Since we had her, she's always seemed diligent about her grooming and we regularly brush her too and we've never had any problems. However, last winter we noticed she had some clumps in the fur at the centre of her back for the last two or three inches before it meets her tail. They seemed to come on quite quickly and we thought we'd rolled in something sticky or something. However, we've kept an eye out for it since and noticed it happening again recently so have upped the brushing.
Due to a miscommunication this morning, the cat got stuck out in the rain. She was quite bedraggled looking by the time I noticed and let her in (she could have used the cat flap!). An hour or so later and she's cleaned herself up and fast asleep. I've noticed, though, that this same spot which gets clumpy is still wet so I'm guessing she can't reach it.
Is that normal? Or do I have a cat whose not very flexible? I'm just a bit surprised as I thought all cats were able to groom themselves all over. I certainly haven't noticed this with previous cats.