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. but can it just be b/c of him pulling on his leash??
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I hope you are using a harness...
A CT / ST cough tends to emerge during periods of exertion when the dog is breathing heavy or panting, or when the trachea is directly stressed (like when a collar presses it). I have actually been wondering if many harnesses out there negate their purported benefits by applying a pressure to the thoratic region of the trachea (throat near the chest). Make sure the forward strap in your harness doesn't press anywhere "soft" and "squishy". It should press against his chest, not his lower throat.
A bad fitting harness might be just as bad as using a collar. Try using two fingers to gently feel around the area that your pup's harness pulls. See if you can feel a ribbed tube, or tendons there or if you are pressing bone and muscle.