The dog with the best scent and the most receptors in its nose would be the Blood Hound, Black and Tan Coonhound, Redbone Coonhound, Blue Tick Coonhound, Tree Walker Coonhound, Basset hound, beagle, or Plott hound etc. Basically any of the working class hounds that were bred for hunting. These are scent hounds and unlike sight hunters (i.e. labs and bird dogs), almost exclusively use their noses to track a scent.
All dogs can pretty much smell the same...it is there brain tellin gthem how to use it!!!
