Features: Large capacity - holds over 2.25 Gallons (288oz.) Improves your pet's health Improves the quality of your pet's life The Drinkwell Big Dog Fountain: Provides pets with an enjoyable "falling stream" of water Removes bad tastes and odors with extra large charcoal filter Adds more oxygen for freshness Easy to maintain Circulation cools water naturally Patented free falling system Let The Big Dogs Drink! The Drinkwell Big-Dog Fountain uses the same innovative watering system as the Original Pet Fountain, featuring the patented free-falling stream of water that consumers have come to rely on for cats and small dogs for the past decade. A large charcoal filter removes bad tastes and odors leaving your pet with fresh tasting, filtered water. Designed by a veterinarian specifically for large dogs, this pet fountain holds well over two gallons of water. The Drinkwell Big-Dog is the most convenient way to provide man's best friend with fresh filtered water for days at a time. The Drinkwell BIG DOG Fountain is a great way to show your pets just how much you care. Our research 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 is with a Drinkwell Fountain. By using a free-falling stream of water, the BIG-DOG Fountain continually aerates your pet's water with healthful oxygen. A charcoal filter also removes bad tastes and odors, giving your pet the best possible - and most appealing - way to stay hydrated!