When the weather is super hot, it is noticeable for a dog to be panting with its tongue out of its mouth. Don't wait for your dog to suffer heat stroke. In those cases, water with ice is best to cool down the body temperature of the dog. And to keep the dog comfortable, train an electric fan so the dog will not feel the extreme heat. If possible, put him in an air conditioned room or hall. Not to brag but we installed a 2-horsepower air conditioner in our living room for the benefit of our dogs. In extreme cases when the dog is already acting strange due to the severe hot weather, wipe his coat with a piece of ice so his body temperature will hastily stabilize. Once he gets cooled, the next best thing is to give it cold water and place it in a cool location.