Why is a cat's nose so wet?
1. Keep your body moisturized
A cat's nose has many tiny blood vessels and glands that secrete a fluid called mucus. This mucus helps keep the cat's body moist. The mucus forms a moist film on the surface of the nose, reducing irritation from dry air and protecting the nose from bacteria and viruses. 
2. Helps with the sense of smell
A cat's nose is its olfactory organ, which helps it perceive its surroundings and locate food and mates. A moist nose increases a cat's olfactory sensitivity because it can capture more odor molecules, thus better perceiving its environment.
In addition, a cat's moist nose can help it distinguish the source and quality of scents, and help it recognize the scents of its family members, thus maintaining family bonds and a sense of security.
3. Heat dissipation adjustment
Cats are animals with relatively high body temperatures, and dissipating heat through their noses is an important way for them. A moist nose increases the surface area of the nose, allowing heat to dissipate and helping the cat lower its body temperature. This is especially beneficial in hot weather.
4. Health and Disease
A cat's nose moisture is closely related to its health. If a cat's nose is abnormally dry or has excessive discharge, it may indicate a health problem such as a cold, sinusitis, or nasal polyps. Conversely, if a cat's nose is chronically overly moist, it could also be a sign of certain illnesses, such as respiratory infections or nasal pain.
