Our little girl, Nami, is very vocal. She has a special greeting for us whenever we come home. And if we reach into the treat jar but don't give her the treat in a timely manner, we hear about that too… she scolds us for being too slow. Nami will also "talk" to the other dogs at the bark-park when they won't play with her.
Our boy, Radar, is just the opposite. We refer to him as "The strong, silent type." He doesn't say much, but when he does, it is very loud! He usually sounds off when he and his sister are wrestling, then Nami breaks away to hide under the dining room table. He'll stand in the middle of the room and let loose with a resounding "bah-rooooooo."