A key lock: a key to open and close, convenient for dogs to drink. Leak proof, don’t waste water when outdoors. You can hold the dog in one hand and give him a drink with the other hand. Large and Small Bottle Capacity: This water bottle holds 550ml of water. Small, easy to carry, large capacity, no need to worry that the dog will not have drinking water to drink outside of play. High quality material: lead free, BPA free, safe and durable, easy to disassemble and clean. BEAUTIFUL AND DURABLE: The old color and exquisite bottle design can bring your dog a comfortable drinking experience. And the unbroken ABS plastic material is durable and more convenient to use outdoors. Safe Water Happy Trip: A sporty dog loves to drink water. Dogs that drink wild water are prone to gastrointestinal problems. If dogs don’t drink enough water, they can easily develop kidney stone disease. With this portable pet drinking water bottle, you no longer have to worry about drinking dog safe water. Why