I have a 4 year old indoor cat, she's a semi long hair. The other day I noticed some white flecks on her, I thought she'd just rolled in a bit of dust or something, but I've just brushed her (I brush her every 2-3 days as she sheds a lot) and there was quite a large amount of dandruff-looking type stuff in the fur I brushed off. I've never noticed this on her before. Does anyone know what causes this, or how to treat it? She is indoor only, has a combo of wet and dry food and 2 water bowls, so she shouldn't be dehydrated. Is there something in her diet that is perhaps missing?