[MShaw]

We use "enough" to get ours to settle down... we started by getting her all riled up, then using "enough," and then treating when she relaxed and saying "good enough."

You can also teach your dog to bark on command, and then when you don't want them to, say "no {insert bark command here}"

You don't want to always tell them not to bark though, so if the doorbell rings and they bark, tell them "good bark" to acknowledge that they did something positive, but then when you want them to stop, use one of your commands that basically tells them that you know there's something out there, and they need to settle down.