Evaluating your dog's health based on whether its nose is cold and wet may not be a reliable indicator. The temperature and relative moisture of the nose varies by breed and situations.
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The nose
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Your dog's nose is very sensitive and has more moisture internally to help it sort smells. Many breeds often lick their noses. Short-nosed dogs such as bulldogs and pubs do not lick as much due to muzzle structure.
Normal wet
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Wet noses should be clear. Any discharge color (yellow, brown or green), thick or odorous is a sign of an infection or problem.
Humidity
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If the air is humid and your dog's nose is dry, the dog may have a problem. Take its temperature to determine if it has a fever. If the air is really dry, it is normal for your dog's nose to be dry, too.
Nose condition
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Even if the nose is wet, if there is cracking or flaky skin, redness or your dog has problems breathing, your dog is not healthy and needs to see a vet.
Too wet
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If the moisture is clear but the nose is running a lot, the dog could have a tumor, allergies or may something stuck in the nose.
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