A dog's nose is 100,000 to one million times more sensitive to smells than a human being's nose. 

In Nose Work, handler teams of person and Sheltie (just like Holmes and Watson) seek specific smells hidden in containers, buried, in rooms or outside. This sport has various levels including Novice, Advanced, Excellent, Master and Detective.

The Sheltie's intelligence and work ethic are its advantages.