My Chihuahua who is now 8 has had a skin complaint for a while now, she was covered in black patches which when scratched rubbed off leaving raw skin underneath exposed. These were all over her including some small spots on her belly. I took her to the vets when I noticed it getting worse, the vet looked it at it and after a bit of umming and oohing said it looked like a rare infection of the hair folicles. Well he perscribed a 2 week course of antibiotics which did appear to clear it up but over the last couple of weeks it has come back and this evening I bathed her only to discover a bit patch of crusty black skin on her back. Anyway I scrubbed if off and to my horror a large patch of skin just slid off taking the fur with it I'm obviously taking her back to the vet tomorrow but would be interested if anyone knows what this is as the vet didn't sound 100% sure himself to be honest!