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.