I was checking my rabbits' like I do every week and noticed an off patch of fur on one of my rabbits. I'm concerned it might be fur mites. It's about the size of a penny, parts of the fur came out easily, and it looks like there's flakes of dandruff in it. It's also reddish at the base, but that might be from me pulling the fur apart to look at it. Any ideas? Fur mites or something else? Treatments? Thanks in advance.