hound (n.) Look up hound at Dictionary.com
Old English hund "dog," from Proto-Germanic *hundas (cognates: Old Saxon and Old Frisian hund, Old High German hunt, German Hund, Old Norse hundr, Gothic hunds), from PIE *kuntos, dental enlargement of root *kwon- "dog" (see canine). Meaning narrowed 12c. to "dog used for hunting."
hound (v.) Look up hound at Dictionary.com
"hunt with hounds," 1520s, from hound (v.). Sense of "pursue relentlessly" is first recorded c.1600. Related: Hounded; hounding.