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It's interesting that the pictured sled teams have a lot of non-husky dogs in them.
I expect the reason is that a Husky breed would carry more fur, and that extra fur, besides the obvious weight, would also cause the huskies to overheat faster. Dogs don't sweat like humans, but they do cool some by radiating heat.
Better for survival to have the fur, but not ideal for race dogs who can count on special protection from a cold Winter.
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