Sounds like you’re doing everything right! Allergies rarely cause coughing in dogs, although it’s not unknown. Sudden changes in temperature can trigger a reactive airway, which some dogs have after kennel cough - although not usually years later.
Of course, another infection is also a possibility, but if he’s completely well, it’s a bit less likely.
Overall, the best thing is to get him checked out and see what the clinical exam shows - good luck!
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