...if a visitor is allowed to bring a dog into a NO-PET building in NYC?

My nextdoor neighbor's friend has been bringing a very large pitbull into the building. Our front doors are 6 inches from each other.

I'm not pleased. He's also been keeping the pit a few nights a week, I just found out from the Super (who has okayed it -- meaning, the 3 months are going to pass that allow a waiver).

Does anyone know what the rules are for visitors/guests and dogs in a NO-PET building?

(I've also posted in the Apartment Living Forum)

Thanks.