A lot of owners of "guardian" type breeds don't want to discourage their animals from barking, in the event that when they "should" bark, they won't. Of course, the guardian breeds aren't heavy barkers to begin with.
I let Brody out this morning before dawn, and he would not stop barking. It was after a storm, and I wondered if something was wrong in the back of the house - but when I went out to inspect I found what he was focusing his wrath out on - it was a trespassing frog.