I have two poms – nine years old and 6 years old from the same breeder, although unrelated. My nine year old began losing her hair at age 3. She lost most of the hair on her back, tail, and back legs. The skin then darkened. I had her thyroid checked – it was a bit low, so we began drug therapy. The hair didn’t return. Now my 6 yr. old Pomeranian has started losing her hair starting a year ago! I feed them a high quality, grain-free diet. It’s very frustrating.