Hello Al, I'm Dr. Deb.
I recently came online and see that your question hasn't been answered. I'm so sorry that you've had to wait for a response,but if you still need assistance, I'd like to help if I can.
It sounds like your two dogs may have developed or picked up an upper respiratory infection (aka kennel cough) during their stay in the kennel. This is somewhat similar to the viruses and bacterial infections that make the rounds at daycare centers for children.
In most cases, the symptoms will pass in about 7-10 days with no treatment necessary. Some dogs will become lethargic and run mild fevers; other dogs will benefit from systemic antibiotics although not all of them will (especially if the underlying cause is a virus).
I'll sometimes suggest over the counter antihistamines such as Diphenhydramine (Benadryl) which can help to dry up secretions. The dose is 1 mg/lb twice a day although sedation can be seen as a side effect.
As to other over the counter treatment options, cough suppressants can be given although I'm often hesitant to use them if kennel cough is the problem. I want those secretions removed from the upper airways and I rarely want to inhibit this reflex.
If the discharge becomes green/yellow or if lethargy or disinterest in food develops, then a vet visit can be a good idea; otherwise, I typically let these infections run their course.
I hope this helps; again, my apologies for the delayed reply. Deb