What is the one essential for any outdoor doggy outing? Water! This BPA free, stainless steel water bottle is built especially for pets. It has two openings: one small one at the top of the water bottle that has a ball-bearing to control water flow when you hold the bottle upside down for Dog to drink (like a hamster water bottle). The second is larger to allow you to fill and clean the bottle. You can also unscrew the whole top of the bottle, flip it over, and it's a cup! It has a carabiner so that you can attach it to your bag and fits in most standard-cup holders so it won't roll around the floor of your car.