what can this biting be?

My shih tzu is constantly biting his tail - raw, I mean 24 hours a day. We had a horibble flea problem this past summer, but no more. I have an app't Friday, but what can this be?

I did a google and 1 site said it could be to get attention..complusive disorder. Anyone hear of this ?

sheezz , I hope there is some medicine, I hear him biting all night and can't sleep myself.

Re: what can this biting be?

It could be flees again. Or I don't know how often you walk your dog, but she could be really bored and simply need a walk everyday. Dogs tend to get destructive when they are bored either to themselves or objects like your shoes.

Re: what can this biting be?

it could be boredom. Also depending on how your groom your dog it could be winter itch. My Crested gets this b/c her tail fringe is so thin that the wind actually can get to the skin on her tail.

Re: what can this biting be?

It could also be the gland in the butt is cloged my dog gets this and when it was really bad before i knew what it was she took all the hair off her tail in one spot.