We adopted our dog from a shelter two months ago. She had these weird spots on her when we got her, and they didn't say anything about them, it wasn't referenced in her vet records, etc. I didn't ask about it because I had thought she was just dirty. The spot on her leg shows what I'm talking about - it appears that both her fur and the skin underneath are dirty. She had a similar spot on her shoulder, but when she came back from boarding two weeks ago, all of the hair had fallen out from that spot, but the skin didn't look as dirty as it did before. The boarder is also a groomer, and she didn't seem concerned either. Finally, she has the same kind of thing going on on her belly, where there is already no fur - it looks dirty, but it does not come off. She does have dark spots on her skin, but this is different. She doesn't mess with these spots; they don't seem to be itchy. She doesn't care if I touch them either, so I assume they don't hurt. I've searched and searched the internet, but I can't find anything similar. If this needs vet attention, I will definitely take her, but it doesn't seem to have gotten worse (or better) aside from the hair falling out of the one spot. Any idea what this might be?