Finn can be agressive with male dogs, usually unneutered ones. Not sure, yet, if it's fear aggression or dominance aggression. I hope to get him into some sort of advanced training to find out if there's anything that we can do about that. And, he will still get ahold of things and chew them up if I leave them out. The other night, he almost chewed up two glue sticks. I got to him before he broke the sticks open, though...