Every forum has this game, right?

It's simple. I think everyone knows it, so ... let's get to the game. Just in case, I'll post the instructions.
First Poster: [me] No one above me.
TPBM has a dog.
Second Poster: Yes.
TPBM doesn't have a dog.
Third Poster: No.
And so on and so forth. Get it? Good. Let me start.
TPBM has played this game before already.