I've had Smaug for a couple of months, and he has shed twice in that time, the most recent being about a week or two ago. However, a couple days ago, his tail shed again, and only his tail. Since then, the last half inch of his tail has gotten very dark and stiff. I watched him shed, so I know it all came off. There is also no change with his behavior or eating habits. He has a bath bowl that he regularly jumps in as well. Should I be concerned?