If your pet frolics in the backyard during Summer months, providing water is absolutely necessary! Hot dogs may not pant when they are thirsty [1], but still need refreshment when the play gets vigorous and their body temps rise. Instead of just adding a bowl (which can become stagnant and harbor diseases like Giardia [2]), the WaterDog ($79) [3] offers the cold beverage on tap whenever he's ready to sip. Using ultrasonic sensing technology to tell when your animal approaches, it immediately turns on a gentle flow of fresh, cool liquid when he's ready. Pup can drink as long as he wants as the flowing fountain will continue until he moves away – that's one tall glass of water!