It is often said that the dog’s sense of smell is a thousand times stronger than ours — a dog has more than 220 million olfactory receptors in its nose, while we have only 5 million. So while our nose can detect a scent we might recognize as “pizza,” a dog’s more sensitive nose will be able to distinguish each ingredient on that pizza. It comes as no surprise then that the sport of scent detection, which combines the dog’s ability to detect scents and follow them to the source, is growing by leaps and bounds.