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300,000,000 Reasons
What do dogs have that we don't? For one thing, they possess up to 300 million olfactory receptors in their noses, compared to about six million in us. And the part of a dog's brain that is devoted to analyzing smells is, proportionally speaking, 40 times greater than ours.
Check out these examples
When cooking a yummy stew, us humans smell "the stew" a combination of ingredients that create one delicious scent. Dogs on the other hand smell, the carrots, the onions, the beef, the potatoes, the celery, the water, the broth etc... Even the container itself. Amazing right!
A drug-sniffing dog once found a plastic container packed with 35 pounds of marijuana submerged in gasoline within a gas tank. Despite the attempt to mask the odor, the on-duty K9 was still able to detect the narcotics.
Detection Dogs
A detection dog is trained to sniff out a particular substance or group of substances. Common types of substances to be sniffed out include illegal drugs, explosives, blood, and human remains. Some detection dogs even learn to detect cancer, abnormal blood sugar levels, certain types of insects (such as bed bugs), or even animal feces.
Military Dogs
These dogs may be used as detectors, trackers, sentries, and scouts. And they can take part in search and rescue.
Most of the military working dogs are German shepherds, Dutch shepherds, and Belgian Malinois.
Police Dogs
Police dogs protect their handlers. They can chase down and hold criminal suspects who try to run from police. In some cases, K9s might be trained to sniff out substances. Those dogs also might be categorized as detection
Search-and-rescue dogs have great agility and exceptional senses of smell and hearing. These highly trained animals serve in many different fields, including tracking, specialized search, avalanche rescue, and cadaver location. Breeds often used include Labrador retrievers, golden retrievers, border collies, Leonbergers, and German shepherds.
Therapy Dogs
These therapy dogs offer emotional support to sick or injured people, often visiting hospitals and nursing homes. They also visit schools and day care centers to help educate children about dogs.
Service Dogs
Service dogs or assistance dogs are working dogs that have been trained to assist people with disabilities.
Herding dogs handle different types of livestock, such as sheep and cows. Herding dogs are basically born for work. That is, dogs are a particular breed and are part of the herding dog breed group.