It has been awhile since I have had a dog, but I don't remember seeing a dog hold a grudge and lash out because of stored anger.
Nahum can play too aggressive for Willow's liking. Last night it sounded like Nahum tackled her down the stairs; a mix of bonks, bangs and angry growls. And as if that wasn't enough, he continued going after her once they hit the bottom. At that point she was snarling and screaming loudly. I scrambled down the stairs to come to her aide. By the time I got there she had managed to get away from him and get to the safe refuge under the couch. Meanwhile Nahum was just sitting out in the open living room, collecting his thoughts when out of no where, Willow leaps out from under the couch runs up to Nahum and smacks him hard across the head and promptly returns to under the couch! Nahum just sat there shaking his head as if trying to clear the cobwebs.
I'm a believer that two wrongs don't make a right. But since Willow rarely strikes back, this time I couldn't help but praise her for a job well done!