How many olfactory cells do dogs have?

Dogs have approximately 220 million olfactory cells, significantly more than the roughly 5 million found in humans. This remarkable number contributes to their exceptional sense of smell, allowing them to detect odors at incredibly low concentrations. Their olfactory system is highly developed, enabling them to distinguish between a vast array of scents, making them invaluable in various roles such as search and rescue, detection work, and more.