how strong is a dogs sense of smell

A dog's sense of smell is extraordinarily strong, being roughly 40 to 100 million times more sensitive than that of humans, depending on the breed. Dogs have about 125 to 300 million olfactory receptors in their noses, compared to around 5 million in humans, and their brains dedicate about 33% to smell processing , versus only 5% in humans. This immense olfactory capacity allows dogs to detect smells at incredibly low concentrations, such as one part per trillion, and track odors from great distances. The dog’s nose also has specialized features like mobile nostrils for scent direction and the vomeronasal organ for detecting pheromones and chemical communication. Some breeds like bloodhounds have the most acute sense of smell, able to smell things far beyond human capability. In summary, a dog's sense of smell is not only stronger in intensity but also far broader in range and complexity compared to humans, enabling them to perform extraordinary feats such as detecting diseases, tracking scents over long distances, and even sensing emotional changes in humans.