LOL, good advice!
Love that show.
I love the Dog Whisperer a tad more though.
But anyways, what I would try... bring a tiny squirt bottle of some sort out
on walks with you and when he begins to bark like crazy at other dogs, etc,
then just a quick squirt in his face may get him to stop. This works for a lot
of dogs, but not all. Try not to let him see where the squirt is coming from.
But he should associate barking with getting water in his face and will eventually
stop, hopefully.
If that doesn't work, I would try to just guide him in a complete opposite
direction when he does that. Let him know when he starts barking at the
other dogs, etc, he's not going to get to walk any further. Simply turn him
around and away from the object he's barking at... and don't begin walking
again until he's calm.