The Drinkwell® Outdoor Dog Fountain is our largest capacity pet fountain, offering 3.5 gallons of fresh, filtered water to your pet. With its free-falling stream of water, pets are encouraged to drink more, and they get the cleanest, freshest-tasting water. This system is perfect for large dogs or multi-pet homes. Made with high-impact UV-resistant plastic, this durable fountain can be placed inside the home or outdoors when temperatures are above 40°F. The dual filtration system removes small particles and catches dirt, hair, and other debris that larger dogs tend to leave behind.