english ethimology

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dour (adj.)
mid-14c., "severe" (of grief); late 14c., of men, "bold, stern, fierce," a word from Scottish and northern England dialect, probably directly from Latin durus "hard," from PIE *dru-ro-, suffixed variant form of root *deru- "be firm, solid, steadfast." Sense of "gloomy, sullen" is late 15c. Related: Dourness.
 
dogged (adj.)
"having the qualities of a dog" (mostly in a negative sense, "mean, surly, contemptible"), c. 1300, from dog (n.). Meaning "persistent, silently obstinate" is from 1779. Hence doggedly (late 14c.), "cruelly, maliciously;" later "with a dog's persistence" (1773). Related: Doggedness.