sleuthhound

[slooth-hound] /ˈsluθˌhaʊnd/
noun
1.
a bloodhound.
2.
a detective.
Origin
1325-75; Middle English sloth track, trail (< Old Norse slōth) + hound1
British Dictionary definitions for sleuthhound

sleuthhound

/ˈsluːθˌhaʊnd/
noun
1.
a dog trained to track people, esp a bloodhound
2.
an informal word for detective