I don't see how such a tiny dog could be useful with his nose. The Dachshund's ancestors bred him to help humans track game with his keen sense of smell.
They have the ability to tell the difference between a random dirt spot and a trail left by an animal. A simple nose-to-the-ground approach will take them straight to their prey if they follow that trail.
The Bluetick Coonhound is another breed of dog known for its keen sense of smell. The pursuit of racoons is in their genes. This puppy can locate a coon no matter how long ago they were last seen.
They'll bark to let their owners know where they are going because they're a cold-nose trailer. This dog has a keen eye for detail but would rather work than relax and cuddle.
This pup has amazing nose work. Labrador Retrievers are great at diagnosing medical issues. Doctors use them to identify cancer patients, and the military and police use them to find bombs and drugs.
The Belgian Malinois sniffs out trouble. Military officials enjoy finding bombs and drugs. They'll warn their handler if they see freight, luggage, or people with drugs or bombs.
The German Shepherd Dog's versatility is only enhanced by his nosey nature. Having millions of scent receptors puts them near the top of the list, which simply means they have a better nose than most.