My dog has a small tag on her back leg. It is black and wart like, which has gotten slightly bigger in the past few months. She is 9 years old.

I have a photo, but it does not show it too well: http://img467.imageshack.us/img467/4444/dsc002407tt.jpg

It hangs off and is smallish. I am wondering if it could be a wart, skin tag or a tumor/cancer. It is black in colour and doesn't bother her.

Any advice would be appreciated.

What does the vet say it is?

Haven't been to the vet yet, I thought it might just be a spot but it got slightly bigger

If it has grown/changed recently I would get it checked out. Better to know exactly what it is.

Yep, I will do.

Just looking for any ideas about what it could be :)