Cincy had that issue when she was a baby...she had cherry eye and surgery for it at about 4 months, and the vet throught is was because of the stress on her immune system. They went away over time and Sadie never got it. I would think if another dog had a comprimised immune system th maybe would catch it from her, but in general, probally not. Tomorrow, I will go back and look and see if I can find any threads about it, but it would have been early in 2002.
Edit to add the link to CIncy's issue
http://petoftheday.com/talk/showthre...ight=papilloma