I understand your concern, 47 Celsius is too hot for a dog like pomeranian because he has a double coat. Why don't you try giving him cool haircuts? I've seen many pomeranians in haircuts, that not only cut off the upper coat, but also gives a charming look to them. Here are few examples of haircuts that you can try on your dog. He will definitely look cool in it, and I hope you won't regret later, and the summer problem will also be resolved in this way. You don't need to worry, as the fur will grow again.