I'm not sure, but I think it could be due to bortitella (sp) as well. Both my labs have had the bortitella vaccination, but Tilly has not (was going to get it next week). To complicate things further, I know Tilly has had direct contact with both my labs, and Kennel Cough is highly contagious.
So needless to say, a trip to the vet is in order.
Anyone else have any experience with Kennel Cough?