The DF-102 Dog Fountain is a pet water dish for larger dogs that automatically refills as the pet drinks. It is ideal for busy working pet owners or when away on short vacations. The wide, funnel shaped rim catches slobber and drips as larger dogs drink and reverts the water back into the bowl. The bowl uses two, 2-liter size plastic soda bottles for the water reservoir. The system works on the vacuum principle so it keeps the water fresh over long, extended periods and will DISPENSE WATER ONLY AS NEEDED BY THE PET! The dish is heavily weighted (10 lbs heavy!) when the water-filled bottles are in place and is 14" in diameter. The non-tip design is molded of sturdy thick-walled unbreakable plastic (under normal use).