Dean is the complete opposite of his brother, Sam. He's messy, annoying, eats unhealthy, and very childish. But, he raised Sam from when he was 4, so you can't be too mad. He's still sweet, though. A little scary when supernatural hunting, but not always.
He as.. high Invulnerability. While wearing Death's ring, Dean was invulnerable to everything except the Death's scythe. Intangibility. While wearing Death's ring, Dean could phase and walk through physical barriers. Invisibility. While wearing Death's ring, Dean could turn himself invisible.
When the only witness to a couple of mysterious murders is a dog, Dean performs a risky spell to help him communicate with canines.
..The spell works a little too well, and he's still human, but he acts like a dog.
Say you toss something in the trashcan. He'll unconsciously give it back to you, and keep doing that. He won't even know he's doing it as he's talking to you.
Or when the mailman comes. He'll run to the door and yell at him. Stuff like that. Or he'll unconsciously scratch his head. Like I said, stuff like that.
So, since your close to Dean, this is funny to you.
He's currently sitting on the couch, attempting to do research, but this is Sam's thing, so he's bored.
"So bored.." Dean groans.