The dog's nose is wet. It is not something secreted by the dog's nose that makes it wet. Dogs can lick their noses with their tongues to keep them moist and sensitive. Licking the nose is difficult for us, but easy for dogs.
There are many reasons why the dog's nose is not wet in daily life. For example, some weather changes and emotional changes will cause the dog's nose to be dry. Cold, fever, canine distemper, short stature, etc. It will also cause the dog's nose not to be wet. while
However, a sick dog will have other symptoms besides a wet nose. For example, dogs with a cold and fever will also be depressed, lose appetite, become lazy if they don't like to move, and shed tears, runny nose and sneeze.