THE PERFECT SIZE: The 32oz Bottle is recommended for Rabbits and Ferrets. It can also be used for Small Dogs. TOP FILL: The Quick Fill top makes it easy to refill the bottle without removing it from the cage. Simply open the top lid of the bottle and pour in water. No need to remove the bottle. NO-DRIP Valve: This bottle features Lixit’s patented No drip valve. It uses a Quality American made stainless steel tube. SECURE MOUNTING: The bottle features a flat surface and a heavy-duty spring to fit securely to your pet’s cage.