What to do if my dog has milk coming from her nipples?

How solver problem tumor the nipple for puppies was sucked milk after that becomestuck milk route to nipple become grow look like tumor? Look a tumor size by hand.

If you need see picture of tumor. I will email to you. Can you help me to understand why got tumor grow? My dog's 9 years old. 3 inches diameter last Dec 2008 til five inches diameter tumor now. (10 months) really fast grow.

Somehow I take something tablets pills or powder help stop pain or kill tumor or other wise. Thanks... for need help.