ILUVCHLOE asks: "My dog has a problem that my vet can't figure out. She is a 4 year old mix, and she has a black wart-like growth on her front right leg. It started out as just one, about 6 months ago, and now she has another just above it. She is constantly licking and chewing on this one, and consequently it is always a little bloody. In general she chews on her front legs a lot, but I don't know if that is the cause of these growths. They are each about 2/3 the size of a dime and stick out about .5-1 cm. Any ideas? My vet wants to biopsy, but that is so expensive."