What do you do now Myka, when he barks?
Our youngest dog can be quite the alert barker (I swear, she hears a mouse in a field 2 miles away
). I let her bark 3 or 4 times and then say "quiet" (without yelling) and she immediately stops and re-directs. This is pretty much what we've done with her with much success...
Maybe it can work for you and Peewee too