Thanks, all.
He had the Bordetella injectible vaccine in January.
I got him some Tussin and have given him a childrens dose twice now.
I disinfected the water & food bowls, the rug he lays on, and sprayed Lysol on the carpet where he's been lying in the house. Poor guy, I know he's confused. He's standing under my window crying to come in, and it's raining. Boy do I feel like a crummy dog-mom, I wish he understood it's not that I don't want to let him in, but I can't.

I hope we can find a vet who will see him early tomorrow. I was thinking that I would leave him in the car till they're ready to see him so he's not hacking all over the waiting room. Gosh, he sounds awful.
Please keep my sweet boy in your thoughts.