Our Drinkwell Fountain is for cats and smaller dogs. The pet Drinkwell Fountain is a first class drinking system that was designed by a vet and induces your dogs natural drinking instinct. The free falling stream helps maintain proper hydration that is essential for keeping pets healthy. This incredible drinking system holds 50 fluid ounces of water. Additional 50 to 70 fluid ounce reservoirs are available to purchase. The Drinkwell Fountain filters and aerates continuously moving the water to keep it fresher and cooler than a standing bowl of water. The pet bowl has 5" tall sides for a deep pool of water to prevent splashing. The pet fountain has many unique features where no assembly is required the flow rate is adjustable dismantles for cleaning has side carrying handles 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 6 foot electrical cord and for peace of mind comes with detailed instructions plus a 30 day money back guarantee and 1 year warranty. Replacement filters are available in a three-pack and should be changed every six to eight weeks. According to the vet who designed this product cats do not drink as much water as they should which can lead to urinary tract problems. Make sure your pet drinks enough water daily with the Drinkwell Fountain.