Drinking Vessels

DRINKING VESSELS There are four drinking vessels which Muslims were forbidden by their Prophet to drink out of (Mishkat, bk i c I) hantam a “green vessel”; dubba, a large gourd hollowed out; naqir, a cup made of the hollowed root of a tree; muzaffat, a vessel covered with pitch or with a glutinous substance. These four kinds of vessels seem to have been used for drinking wine, hence the prohibition.
When a dog drinks from a vessel used by man, it should be washed seven times (Mishkat, book iii c ix pt I)

Based on Hughes, Dictionary of Islam