Answer: bedog

AnswerCrossword Clue
BEDOGHound excessively.
BEDOGHound.
BEDOGHound repeatedly.
BEDOGPursue closely.
BEDOGTrack stubbornly
BEDOGTail closely
BEDOGKeep on the trail of
BEDOGFollow relentlessly
BEDOGHound