A bloodhound or, especially, a similar hound formerly used in Scotland.
1607: Edward Topsell, The History of Four-footed Beasts - The Blood-hound differeth nothing in quality from the Scottish Sluth-hound, saving they are greater in quantity, and not alway of one and the same colour...
1876: May Agnes Fleming, The Midnight Queen - What a fool, idiot, and ninny I must have been, to have left her as I did, knowing those two sleuth-hounds were in full chase!
