This sounds like an upper respiratory disease.
It could be kennel cough which you can read about here to compare symptoms
www.marvistavet.com/html/kennel_cough.html
however if he seems really ill it could also be the new canine flu
www.marvistavet.com/html/body_canine_influenza.html
If you feel he is seeming really off you should have the vet see him as he may need antibiotics.
Hope this helps you!
__________________
Please press Accept if you find my answer helpful. Want more info? Just reply on your question!
Bonuses for good work are always appreciated!
Thanks for the opportunity to help you!

