Our BIG-DOG Drinkwell Fountain is for medium to large dogs and is a first class drinking system that was designed by a vet and induces your dogs natural drinking instinct. The free falling stream that simulates running water that dogs love helps maintain proper hydration that is essential for keeping pets healthy. This incredible drinking system holds 2.25 gallons of water and includes an additional capasity reservoir. The BIG-DOG Drinkwell Fountain filters and aerates continuously moving the water to keep it fresher and cooler than a standing bowl of water. The dog bowl has 5" tall sides for a deep pool of water to prevent splashing. The dog fountain has many key features where no assembly is required the flow rate is adjustable dismantles for cleaning snap on lid to prevent accidental removal charcoal filters absorb unwanted tastes and odours rubber feet to prevent slippage fits standard three pin plug socket and for peace of mind comes with detailed instructions plus a 30