The Collaborative International Dictionary of English v.0.48:

Dog \Dog\, v. t. [imp. & p. p. Dogged; p. pr. & vb. n.
   Dogging.]
   To hunt or track like a hound; to follow insidiously or
   indefatigably; to chase with a dog or dogs; to worry, as if
   by dogs; to hound with importunity.
   [1913 Webster]

         I have been pursued, dogged, and waylaid. -- Pope.
   [1913 Webster]

         Your sins will dog you, pursue you.      --Burroughs.
   [1913 Webster]

         Eager ill-bred petitioners, who do not so properly
         supplicate as hunt the person whom they address to,
         dogging him from place to place, till they even extort
         an answer to their rude requests.        -- South.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dogging
    adj 1: relentless and indefatigable in pursuit or as if in
           pursuit; "impossible to escape the dogging fears" [syn:
           dogging, persisting]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "dogging":
   aggravation, annoyance, bad news, bedevilment, bore, bother,
   botheration, bothersomeness, chase, chasing, crashing bore,
   devilment, difficulty, downer, drag, exasperation, follow,
   follow-up, following, harassment, harrying, headache, heeling,
   hounding, hue and cry, hunting, molestation, nuisance, persecution,
   pest, problem, prosecution, pursual, pursuance, pursuing, pursuit,
   quest, searching, seeking, sequel, sequence, series, shadowing,
   stalking, tailing, tracking, tracking down, trailing, trial,
   trouble, vexation, vexatiousness, worriment, worry