Thanks for the response Beeniesmom! I appreciate it! You know how your imagination runs away with you sometimes...the more noone responds, the more I think it's rare and serious!!

He had the shot over 3 weeks ago so I can't imagine it's that?

I am more worried that the shot wasn't given far enough ahead of the time he was to go into the kennel and that he contracted kennel cough??
I mean, he has been getting these shots for the 4 years I have had him, every six months. And the kennel requires this shot for all dogs boarded there so no dog should be there without protection.....
Hmmm, kennel cough is very unlikely...Another thing that causes wheezing I know is heartworm but he takes the monthly pill and he just had a test done 3 weeks ago and that was negative too.