Rebecca : Hello,
Rebecca : Thank you for your question. My name is Rebecca. I am a veterinarian, and will do my best to help.
Rebecca : True warts are caused by a virus, and do eventually go away on their own.
Rebecca : However, we often call little growths "warts" but they are actually growths, and do not go away.
Rebecca : The most common growth that looks like a wart, especially in older dogs, is an adenoma. They are benign, but ugly and sometimes will bleed.
Rebecca : Here are some pictures of them:
Rebecca : Cut and paste this into a browser: pictures of dogs sebaceous adenomas
Rebecca : You can freeze warts, but you need supercold freezing agents, like liquid nitrogen. This is not something you can do at home; ice is not cold enough.