Symptoms of dog heatstroke:

1. The body temperature will rise to 40°C and above. The continued rise in temperature will cause the dog to breathe faster, have a rapid heartbeat, etc. ;

2. It will cause the dog's appetite to decrease, but the amount of water it drinks will increase greatly;

3. It will be slow to respond, and will not respond or respond slowly to the owner's shouts;

4. Unsteady steps, stretched neck, foaming at the mouth, and in severe cases, shock, coma and other symptoms.

First aid measures for dogs suffering from heatstroke:

1. First, move the dog from a high temperature or sun-exposed environment to a cool and ventilated place to rest or lie down.

2. Use cold water baths, cover the body with wet towels, and put ice packs on the head to cool down the dog.

3. Give the dog oral saline in a timely manner, and wait until the dog’s body temperature drops below 38.5 degrees, then stop cooling immediately.