Siberian Husky rear leg shaved due to the surgery to repair her torn ACL, and that hair hasn't grown back. She is on thyroid medication and extra doses of zinc, daily. Does the ZINC help with the hair regrowth and will the hair grow back? It has grown back on the legs where the IV and the post-pain killer patch were put and also directly over the incision, but nowhere else and she was shaved from just above the paw to above the leg on the inside and outside.