The Green Pet Shop Cool Pet Dog PadA comfortable and refreshing hot weather option, The Green Pet Shop's Cooling Gel Pads immediately get to work as soon as your dog lies down. Since the cooling technology is pressure activated by your dog's weight and heat, there's no need to worry about running out of the chill! The cooling gel formula lasts up to 3 hours and once the pad is left alone, recharges itself in 15 20 minutes of non use. There's no water, refrigeration, or electricity