I do chuckle at one of mine, who definitely has a range of meanings to her barks. One solitary "WOOF", repeated at an interval means, "I'm stuck in the paddock,

I do chuckle at one of mine, who definitely has a range of meanings to her barks. One solitary "WOOF", repeated at an interval means, "I'm stuck in the paddock, please let me out." She has another for "I've got a raccoon up a tree," and a gruff huffing noise for, "get off your ass and take us for a walk!" I'm pretty sure I'm at least as much the trainee as the trainer here though.