I would like to add that the short-coated races without undercoat suffer in heat more than CsW, because the (although thin in summer) undercoat protects them from warm weather also. It is like in India - people walk around not in shorts and naked, but in long dresses of many layers, which protect them from the sun. The layered dress, as well as good coat with undercoat, creates microclimatic conditions which prevents overheating as well as loss of water and salts from the skin.
The CsW are better equipped than other dog races not only against winter, but against all kinds of weather. And, the long distance runs are done in much slower rates, a wolfdog is able tu trot at 19 km/h, but the average velocity to pass the exams excellently is 12 km/h and to pass them at all 10 km/h. That gives enough time for rests, drinking and other things to prevent dehydration and overheating.
I agree that to make this exams in the middle of summer would not be good (although I played soccer at high summer Texas noon and didn't fall dead - and I am no wolfdog either). Therefore the exams are held in spring and autumn and start early in the morning.
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