After a dog suffers from heatstroke, he or she will have symptoms such as low energy, lack of food, dry nose, slow reaction, elevated body temperature, shortness of breath, rapid heartbeat, vomiting, and coma. When you find that your dog has symptoms of heatstroke, you need to immediately take your dog to a cool and ventilated place to rest, and let your dog drink more water. You can also use cold water to rinse your dog's body. If your dog's body temperature drops, immediately give it a rest. Cover yourself with a blanket to avoid hypothermia. If the situation is serious and you suffer from shock and coma, you need to be sent to the hospital for rescue immediately.