What's the difference between sleuth and sleuthhound?

Sleuth

Definition:

(n.) The track of man or beast as followed by the scent.

Example Sentences:

(1) This was the result of more than a year of dogged cyber sleuthing and old-fashioned detective work, and news of the arrest broke the following day, 2 October 2013.
(2) The man who found the deleted scenes is movie sleuth and champion of lost causes, Darren Gross, who works in MGM's technical services department (which archives, preserves, restores and remasters the studio's movies).
(3) A Slight Trick of the Mind, adapted from the novel by Mitch Cullin, is set in 1947 and finds the sleuth living in retirement but still haunted by an unsolved case from half a century before.
(4) Becoming a detective has not got easier but perhaps a little less complicated as for the first time aspiring sleuths can apply directly for the role of detective constable without having to work as beat officers in uniform first.
(5) While we concede that sleuthing is not the realm of a surgeon, we believe that there is a clear need for better communication among all concerned with shooting injuries.
(6) Since Edgar Allan Poe’s Dupin (arguably the first detective), sleuths have solved crimes by putting themselves in the position of the criminal, by becoming what Poe called a “double Dupin”.
(7) Yet you don't have to be a sleuth with knowledge of the dark arts of international espionage to be able to use Google.
(8) Now sleuthing from a crime novelist has uncovered a new possibility: arsenic poisoning.
(9) At the end of Sunday night's second series finale, Benedict Cumberbatch's sleuth seemed to plunge to a sticky end after a struggle with his nemesis Moriarty.
(10) Benedict Cumberbatch’s modern sleuth drew 12.7 million on New Year’s Day, making it the most-watched drama of 2014 to date and on course to beat regular bankers such as soaps EastEnders and Coronation Street and award-winning period drama Downton Abbey.
(11) Sky Arts snapped up Spain's Downton-esque period piece Grand Hotel, Italian sleuth-fest Romanzo Criminale and Israel's Hatufim, which was the inspiration for US smash Homeland.
(12) The real lives of the real protagonists are starting to turn into an aural video game for amateur sleuths.
(13) Ritchie is hot property in Hollywood after directing two Sherlock Holmes films starring Robert Downey Jr as Sir Arthur Conan Doyle's ingenious sleuth.
(14) There are more and more people piling on to the internet and the number of entities pumping out material keeps growing,” says Mikkelson, who turns out to be a wry, soft-spoken sleuth.
(15) That would make for a pretty dull crime plot, though, so naturally she is framed for a murder (committed via baked goods) and turns amateur sleuth to clear her name.
(16) GSK was not mentioned during proceedings that shed rare light on the operation of corporate sleuths in the world's second largest economy, but the firm is at the centre of a complex web of allegations.
(17) Internet sleuths quickly investigated the matter: Max Blumenthal (@MaxBlumenthal) .
(18) Sherlock will return to BBC1 on New Year's Day when the mystery will finally be resolved how the sleuth survived that plunge to his apparent certain death.
(19) But, for all the hype about Cumberbatch switching from being the sleuth of Baker Street to the conscience of Elsinore , it would be absurd to see this as a piece of dubious celebrity casting.
(20) Looking at internal data over the last 10 years, the society identified five main users of libraries: "career builders", who use their libraries' resources to write CVs and practise interviews in meeting rooms; "health detectives", who track down information about particular conditions; "little learners", five- to 10-year-olds who love reading; "friend finders", who use libraries to meet people in their local communities; and "research sleuths", who track down information about their family or community histories.