Lol!!! He actually gets this very deep bark when he gets frustrated! He did it earlier when playing with Koda (she wanted him to chase her but he gets mad when he can't catch her). He bounced from how much effort he put into it, then he just froze and stared at me like, "Where did that come from, mom?"
We were watching Batman Beyond: Return of the Joker last night, and Ash was barking up a storm at the hyena guy and the Joker. xD
Mom To~ Dakoda (b/t GSD), Acheron (black GSD)