The basset hound is second only to this dog breed in having the keenest sense of smell
The 
Devoted Bassett Hound is a Close Second for the Best Scent... [DOC] [TLE] Dogs With The Best Sense Of Smell - PetParent [PAR] Apr 29, 2014 ... Basset's are said to have the second best sense of smell- only behind the ... 
some of the hound breeds who bark, howl, and bay along the way.