Just in case you've ever wondered why...
Researchers believe they have discovered why dogs have such wet noses.
A study into pups sniffers has revealed that they use their noses as ultra-sensitive heat detectors - and not anything to do with body temperature regulation.
Scientists in Sweden and Hungary found that when the room temperature was 30C, the tip of a dogs nose was around 5C cooler.
And when the outside temperature was 0C, a dog's nose would be about 8C. The two factors equal out at 15C.
This suggests that the wet tip of the nose is used as a heat sensing detector, according to the study published in the Scientific Reports journal.
Meaning a dog's nose can detect very faint heat sources - such as small animals - from 1.5m (5ft) away.
"All three dogs could detect stimuli of weak thermal radiation in double-blind experiments," said the researchers.
"In addition, we employed functional magnetic resonance imaging on 13 awake dogs, comparing the responses to heat stimuli of about the same temperatures as in the behavioural experiment. The warm stimulus elicited increased neural response.
"All stimuli of radiating heat used in our experiments were too weak to be felt by human hands, even at very short distances. We had to touch the surfaces to feel the warmth."
Another of life's great mystery's solved!
