My little 3.4 pound Pom turned 12 in August and imagine that, she started shedding like a banshee. I took her to the vet and also showed him a small bump on her abdomen which turned out to be a hernia. He did a blood test and they operated a couple of days later. I reconciled this $600 monetary behemoth by telling myself that my Pom has been relatively healthy for most of her life and her hernia is fixed and she also has clean teeth. Then the vet told me that her thyroid numbers were low and recommended giving her a supplement, which must be given for the remainder of her life. I hesitated but she continued to shed like there would be no tomorrow. She shed to a point where she only had about a quarter of her coat left. In all of her years she had never done this before. So, with some reluctance, I agreed to thyroid supplement, since shedding seems to be one of the symptoms of a low thyroid. She stops shedding and I was happy we caught her low thyroid so early.