I think both should be penalized with "penalty points," and it's even a question of who deserves it more. I've been following the development of this conflict from the very beginning, and it's clear that Siever didn't start the trouble out of nowhere.
I don't know, maybe Siever is just a funny little pet here on the forum, and that's why he's getting away with so much. But as an experienced dog owner, I know that even if a cute and fluffy little dog bites someone's leg, the person who was bitten still has every right to be upset and demand compensation for emotional distress from the dog's owner.