Okay. Great. Thanks for the additional information. I really appreciate it.
I think I'd give it a couple more days and see if this really is kennel cough, or if it's a reaction to the medication he's currently on.
As you may, or may not know, kennel cough is considered 'self limiting'...meaning that it only gets so bad before it goes away on it's own. We generally see problems with older dogs, puppies or pups with a compromised immune system due to something like cancer or other chronic issues. We don't even tend to send out medication unless it seems to get worse or they have problems breathing.
Putting him in a steamed room could help him cough become more productive, although I've heard mixed reviews on that trick. Some people swear it made the dog feel better, some don't think it did much at all. When I brought my dog home with kennel cough, I tried the steamy room and all it did was make us both limp and damp. It won't hurt to try though, but don't be discouraged if nothing changes.
As for the progression of kennel cough, I've found this site to be extremely helpful, and we even give the address of the site to our clients with pets who have kennel cough. It's very enlightening and really talks you through this process: http://www.peteducation.com/article.cfm?cls=2&articleid=452 .
And finally, a homeopathy site that might give you some tips on what you can do at home to help your pup: http://www.auntjeni.com/kennel.htm .
I hope this helps!!