the cold wet dogs nose is a sign of health and everything else is a sign of illness is a myth
Dog Noses – facts and myths
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Does a dry nose mean a dog is sick?
This is a common misconception. An active, sniffing dog will often have a cool, wet nose, but a dry nose does not necessarily mean the dog is unwell. A feverish, lethargic dog might have a hot, dry, nose, but so might a perfectly healthy dog. A sick dog will usually have other symptoms. For example, a dog with a respiratory illness might have a very wet nose, but it might be runnier than usual, with thick or crusty discharge
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9 of the Biggest Dog Myths
This one is probably the biggest dog health myth around. Somewhere along the line, people came to the conclusion that a cold, wet nose is a sign of a healthy dog and a warm or dry nose is a sign of illness
...The temperature and moisture of your dog's nose are not miracle measurements of his health. For instance, a dog's nose is often dry and/or warm if he has just woken up, and this is perfectly normal. However, a nose that is persistently dry and crusted might be a sign of a health problem. If you notice an abnormal appearance to your dog's nose or any other
signs of illness, contact your vet right away.[/quote]