How much do you know about the secrets of your dog’s nose! The little dent is the secret conduit: The little dent at the bottom of your dog’s nose, called the “philtrum,” is where moisture is transferred to the moist nose. Use your tongue to wipe your nose: Dogs cannot wipe their nose with paper towels, so they have to lick or sneeze to clear their nose...
How much do you know about the secrets of dog noses? 
Wet nose captures odors:A dog's nose is fine even if it's not wet, but a wet nose can pick up scents better and make their sense of smell more sensitive.
Watch out for dry nose:While your dog's dry nose doesn't necessarily mean he's sick, crusty skin or ulcers could be a sign of a health problem.
Small dents are secret pipes:The small indentation at the bottom of a dog's nose, called the "philtrum," is where moisture passes into a moist nose.
Wipe your nose with your tongue: Dogs cannot wipe with tissues and have to lick or sneeze to clear their nose.
Move the nostrils independently:Dogs can move their nostrils individually, one at a time. Studies have found that they prefer to use their right nostril to sniff non-threatening things, and when they detect a threat, they only use their right nostril.
There are cilia on the nose:Dogs have sensors on their noses that can detect tiny particles. When dust, pollen or debris is present, cilia in the nose and lungs stir, triggering sneezing and clearing out the irritant.
Turbinates amplify odor:The "turbinates" in the nasal cavity enhance odor and allow dogs to smell better.
Smell out emotions and states:Dogs can smell changes in emotional and physical states, such as fear or pregnancy.
Touch your nose to collect information: The dog's nose not only greets people, but also collects information about the surroundings, such as asking: "Are there any good things around here?"
Resolution time:Dogs sense time through smell and predict when their owners will return home.
Teeth vibration transmits odor:Dogs use tongue or tooth vibrations to transfer scents to their noses, allowing them to better analyze scents.
Smell out cancer:Dogs can smell different types of cancer, it’s amazing!