Why are dogs’ noses wet? - 4aPet

A dog’s sense of smell is one of their most amazing features, and a dog’s wet nose helps to amplify this sense of smell. By excreting a thin layer of mucous across their nose, dogs are able to better absorb the scents they encounter in their environment. Once absorbed into the mucus, a dog can then lick their nose to remove the scent and bring it to the olfactory glands on the roof of their mouths. In addition to enhancing a dog’s sense of smell, a wet nose also helps them to regulate their body temperature. Because dogs lack normal sweat glands throughout their body, they instead rely on secretion of sweat through the pads of their feet and their nose to help cool down.

source: https://aspengrovevet.com/