We all have evil within us, and good. The holocaust taught us that, if anything.
Dogs are more like us than your article allows, I feel. They know damn well when they've been bad or good, and they're way smarter than we sometimes give them credit for. Like humans, dogs are pack creatures, they exist within a social fabric, and that's why I'd bring them under the construct of laws of good and evil. It's why we're such good pals with dogs, I think, better than with any other animal. :)
But, do the or is this based on what we consider, what we rad into their behaviours. We can't possibly know what they actually think (at this point).
But again, we are applying human definition to an unknowable.
Tests show that dogs read human emotions about as well as we do, I heard. I really think the whole "they're only animals, we're just anthropomorphising" is wrong. Maybe they're only as smart as very small children, but they are smart, emotionally, in a human way. That's just what I think, anyway. :)