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.

I have been pursued, dogged, and waylaid. -- Pope.

Your sins will dog you, pursue you. --Burroughs.

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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Dogged \Dog"ged\, a. [Fron. Dog.]

1. Sullen; morose. [Obs. or R.]

The sulky spite of a temper naturally dogged. -- Sir W. Scott.

2. Sullenly obstinate; obstinately determined or persistent; as, dogged resolution; dogged work.

Source: Webster's Revised Unabridged Dictionary (1913)