MY little yorkie is also the same way. this is the second time this has happened. It is so thin and short it looks like she has a schnozer hair cut on her back end. The hair on her feet and ankels are still there. My daughter said she looks like she has bell bottoms on lol. She is a year old today and her hair never seems to grow... it is so thin...the hair on her head wont even hold a barrett in. Im afraid to use rubber bands cause she has no hair to spare if the bands pull some out. I noticed her itching and scratching and biting back there but didnt see a flea. Hopefuly one day she will be that beautiful long hair yorkie I have been wanting for years.....but I wouldnt trade her for the world.