Am I worrying too much? I noticed the past day that he keeps biting at this one spot, and I noticed it was balding. I took a picture of it. Can anyone give me any ideas on if this looks normal or not? I tried to compare it to the rest of his skin on the tail but couldn't get past all the fur.
Picture of the spot he keeps biting: http://puu.sh/9DA69/217d1da5da.png