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Answer:
Dogs don't sweat so a little moisture on the nose keeps it cooler (hence it's cold) and therefore helps to keep the dog cooled down on hot days.
Some scientists suggest that extra moisture on the nose may increase a dog’s smelling capacity.
Dogs can pick up moisture from the ground or grasses, and if the weather is cool, their noses are liable to be even cooler.
Dogs often lick their noses especially after a messy meal, this possibly enhances coolness and transfers moisture to the nose.
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