We think it's the best dog bottle ever. Your dog simply licks the top of the Pet Water Bottle and the bottle releases a flow of water. You only need to carry the one bottle for your dog - no need for a bowl and none of the leaky plastic bottles. The dog bottles are made from stainless steel and BPA-free plastic, so they are hygienic, free from harmful chemicals, and easy to clean. Best of all, they're leak-proof and won't drip in your bag. The dog bottle is perfect for the outdoors, walks, camping trips, pet shows, exercise days, and even grooming days. They are also good if you are on a horse or bicycle. How Does our Dog Bottle Work This cleverly designed dog bottle features a patented floating ball in the nozzle that dispenses water as the dog licks. When the dog bottle is turned upside down, the weight of the water holds the stainless steel ball down which blocks the water from flowing out. When the dog touches the ball, its' tongue pushes the ball up and releases a flow of the water. It's all about lick 'n flow. What else makes them different from other dog bottles? In addition to the patented rolling ball, our dog bottle is made from stainless steel. It has a large opening making it easy to clean and refill and can also take ice cubes to keep the water cool. Both the spout and the cap are made from a BPA free, food-grade quality, FDA specified polypropylene, meaning it's healthy for your dog and for the environment. Another unique factor is that with most flasks, the cap screws into the mouthpiece, which exposes the contents to the elements. The dog bottle cap fits over the drinking spout, thereby protecting it. And for convenience, the cap is connected to the dog bottle by a chord, allowing the user to leave it hanging without fear of losing or dropping it.