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Thermal regulation of sled dogs
Sled dogs have a particular adaptation to the cold thanks to vasomotor reactions which allow them to regulate the temperature of certain parts of their body. Vascular heat exchanges allow them to lower the skin temperature of their paws and muzzle to around 32°F (0°C) - the snow temperature - and thus avoid a significant heat loss which would melt the snow, wet their coat and could cause them frostbites.
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