Both of mine have sensitive throats (react to bitey face, irritation from sugar granules/homeopathic supps, dust/grass pollen), so we have times when the throat is definitely irritated.
Both of mine have fits of barking for one reason or another and, lots of times, their barks following shortly thereafter will be weird.
So that could absolutely be normal when viewed through my eyes.
But since they were kenneled, I'd be keeping my eyes/ears open in case it's indicative of something like Kennel Cough (or coincidental onset of something like LP, especially if Cooper is a leash puller when being walked and the walker allowed that).
Hope he's just got something in common with mine.