Our Coops is pretty quiet unless he wants food or something then he'll give you a bit of lip.
But I can well imagine that if Cooper ever has another cocker buddy in the house we will be having the same problems you!! He loves to shout to other doggies we see on our walks. Usually if the other dog is on a lead, like he's being cocky saying 'you can't get me'!
I will be on Ebay bidding if you have to resort to Plan B.
Hope things get better for you soon.