slouthhound

from The Collaborative International Dictionary of English v.0.48

Sleuthhound \Sleuth"hound`\, n. [See {Sleuth}, and cf.
   {Slothound}.] (Zool.)
   A hound that tracks animals by the scent; specifically, a
   bloodhound. [Spelt variously {slouthhound}, {sluthhound},
   etc.]
   [1913 Webster]