Dudley play growls too, only when we are playing tug. We are still struggling with the drop it command; he's a lot like Chip--only drops it when he gets a treat in return. My favorite thing he does is when we are in the middle of a game of fetch and he hears something outside. Instead of dropping the toy, he keeps it in his mouth and does this muffled bark thing to warn any intruders. He sure looks vicious witha big stuffed toy in his mouth
