Kiwi had a wad like that, much smaller mind you, but we managed to comb it out. We used a fine grooming comb to work it out. It took quite a bit of passes and some considerable force to get out. By considerable I mean it would probably hurt like **** if you were brushing a knot out of your hair. But knotted hair is still attached to your head. I suspect that the clump was already detached, but just stuck in place, the fur being so thick and all, so I don't think it hurt her. She didn't cry or anything, and she was already squirming, as being held down and groomed is the last thing any chinnie wants.