Perry doesn't demand bark - but he does bark at things around the house (after a quiet first 2-3 months, the last month has been a lot of barking). We're working on a 'quiet' command - not to tell him to never bark - he's a dog, they should be allowed to bark at something new, scary, a stranger in the yard, etc - but to then ask him to quiet down when I tell him.
We're having varied success. I think he knows what I want - I'll tell him and he'll stop, or I'll tell him and he'll come running in to check in with me (check if I'm serious?) and I'll back it up with a 'shh' (finger over lip) gesture and he'll stop (treats provided), but other times, if he's really serious about it (for example, he doesn't like our night guard, so he will continue barking at him no matter what I say) so I'll have to go and physically get him before he'll stop or he'll continue until I come check it out (when he's barking at the neighbor's dogs or a snail in the yard).
I'm also working on stopping some of the behavior before it starts - for example, when we're outside and I can hear the night guard coming up the stairs to the yard, I'll call Perry over and give him a treat, and same if he seems like he's running over to follow him/ bark at him, but it's slow going.
I did read that the best way to teach quiet was to teach him to bark on command first, but we haven't tried that yet - it seems much more complicated to me