Thanks for the quick reply.
There are a couple of things that could do this. Kennel cough being one.and inhaling a grass awn, foxtail or some other plant material could be another cause.
Incubation period for kennel cough is as long as 10 days, even up to 2 weeks so this is unlikely the cause, but still remotely possible. 6 months is probably the maximum time for full protection from the vaccine (as an aside, it might be worth it to booster
the vaccine 3 weeks or so be fore kenneling again). If in the off chance it is kennel cough, it is a self limiting disease and should resolve in a week or so with no treatment. To provide some relief from the cough you can put your dog in the bathroom with some steam from the shower for 15-20 minutes 2-3 times a day.
If your dog inhaled a grass awn or foxtail it could eventually be coughed up, or it could be lodged there. If it is just a mild irritation it will likely pass in a few days.
There are a few things to watch out for that will require a vet visit as soon as possible: If your dog stops eating, develops difficulty breathing, chest discomfort, unwillingness to eat, severe vomiting, coughing up blood or thick mucus he needs to be seen. If it persists in the mild for and you decide to take your dog to the vet, they may put him on antibiotics, cough supressant, do a chest xray, do blood work or even scope his airways to try to find the source of the problem.
You can try feeding
some active culture yogurt, 1-2 tablespoons/day. It can help soothe his throat.
I'm attaching links to a few websites that may be of interest to you
I hope this helps
I'll be on and off-line throughout the day in case you have any follow-on questions