Dogs can smell continuously, even as they breathe in and out.
Dogs' sense of smell is between 10,000 and 100,000 times stronger than humans
Dogs can wiggle their nostrils independently, which allows them to determine which direction a scent is coming from. Humans can only wriggle their nostrils together.
Dogs are excellent at understanding all information received through their noses in exact detail.
Finally, a dog's nose has the extraordinary ability to detect human emotions! They can detect happiness, fear, anxiety, stress, perspiration, and adrenaline.