[BellaDonna]

One thing you can try will take a little time but it can work if you only have 1 or 2 dogs.
First you teach the dog to bark and respond to you when you say "Speak". You train them to do this on purpose barking and treat when you say "speak" and they do. Then you continue that trick by teacking them to stop speaking when you say "Enough". So what you are teaching them is to bark on command but also to stop on command. Like I said this works very well if you have only one dog and for up to 2. If you have a pack it is much less effective.