Dogs have almost no sweat glands. They can only try to regulate their body temperature by panting or by perspiration through the pads of their paws.But only a small fraction of a dog's excess bodyheat can be lost this way. Therefore dogs are prone to heatstroke, which can cause permanent organ damage, a coma or in some severe cases even death. Put your Aqua CoolkeeperTM in cold water and it will be ready to cool your dog in a minutes! Aqua Coolkeeper stays cool up to 5 days!