LOL!!! It's super cute....but I can see how annoying it might get after awhile...
I have used a spray bottle on my little barker (spritzed her a little water while I said NO) and it made a world of difference...now all I have to do is SHOW it to her...and I get immediate silence! lol

Then once he's quiet...you can always give him a treat...he'll catch on......eventually.....mommy likes it BETTER when I'm quiet...