Canine Papillomas are the result of a virus. The warts look a bit like a cauliflower and are usually round. The are found on the lips and/or muzzle of a dog usually under two years if age. The incubation is between one and two months and they are transmitted through contact with an infected dog. It is contagious to other dogs, but not to humans or other animals. The warts disappear as the dog's immune system strengthens. They are not known to be malignant — antibiotics may be need to stop a secondary infection caused by bacteria in the dog's mouth. There is not a true treatment for this ailment as they do disappear across time, but do consult your vet. Do NOT try to remove the warts at home.