While us humans have about 6 million scent receptors, dogs have up to 300 million which makes their sense of smell around 10,000 times stronger than ours.
What’s more, dogs possess an additional olfactory organ called Jacobson’s organ (or the vomeronasal organ), located just above the roof of their mouth. This special structure helps them detect pheromones—chemical signals that reveal detailed information about another individual, whether it’s a fellow dog, another animal, or even a human. Since that’s plenty of data to process, dogs’ brains dedicate about 40 times more space to scent than ours do, which is what makes them superheroes of smell, able to track down anything from hidden drugs to changes in blood sugar. With this in mind, it really doesn’t come as a surprise that they make extraordinary service dogs that help the ill and the vulnerable.
