I have noticed a small bald spot on the base of Idgie's tail as well. It is white skin underneath and at first just looked like a 1/2 inch white line on the top of her tail at the base. I'm not sure what happened and if she chewed it or not. I've had her for 5 years and she has never chewed before. She may have a little stress since I have been home during the day lately and may be disrupting her sleep routine. Otherwise, she seems totally normal. If it gets worse or red, do I take her to the vet? (If it is fungal and not just behavioral?) Should the fur grow back there?