The Drinkwell Big Dog Fountain provides an excellent way to keep your pets hydrated days at a time. This easily maintained fountain holds well over two gallons with its included reservoir making it perfect for multiple pet households. Reasearch shows that one of the best ways to improve your pet's health is to get them to drink more water, and the best way to do that it with a Drinkwell fountain. The patented free-falling stream of water continually aerates the water supply, enticing your pet to drink more. A charcoal filter removes bad tastes and odors, giving your pet the best way to stay hydrated. This model features a five inch deep bowl to help prevent spills and a gallon reservoir to increase capacity and make refills easy.