If your dog is at risk of heatstroke, ice cubes alone probably won’t be enough to cool him down. Have him lay on a cold surface and offer small sips of water. You might also place a cold compress on your dog or mist him with cool water to help him return to his regular core temperature. Heatstroke is a serious condition that could be life-threatening. If your dog is exhibiting the symptoms of heatstroke, contact your veterinarian immediately.