Its good he had the kennel cough vaccine. The bad news is it doesn't cover all the kinds of kennel cough and it only lasts about 6 months.
He may have kennel cough
www.marvistavet.com/html/kennel_cough.html
or he may have picked up the new canine flu for which there is no vaccine
www.marvistavet.com/html/body_canine_influenza.html
If he is really off I'd see the vet as either can go into pneumonia pretty easily.
Don't blame the kennel, as boarding a dog is rather like sending your kid to school, if a germ is going around everyone is likely to get it!
Hope this helps you!
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