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Welcome and thanks for asking your question. My name is***** am a licensed veterinarian. I am sorry for the delay in response. If you would like to continue can you please answer a few questions so that I can be well informed and give you the best advice.
1- Has your vet done any testing like xrays?
2- I will assume your vet examined his heart and it is normal, correct?There may be a slight delay between your follow ups and my replies as I type out a thorough reply for you.
Friend, what you are describing in Gizmo is not likely related to kennel cough. Instead, it sounds like he has a condition called: "Tracheal Collapse." This is when the rings around the trachea (tube connecting mouth to lungs) become weak and collapse; when this happens the patient will hack/gag to re-open the tracheal lumen. It is also important to rule out an underlying heart/lung disease that can also have similar symptoms.
In this case, I would strongly recommend having Gizmo re-check by family vet and discuss with your veterinarian about doing xrays of the chest for Gizmo. As far as treatment it will depend on exact underlying cause. If this is related to a collapsing trachea he may need one or a combination of cough medicine, anti inflammatory or/and a bronchodilator. For now you can start him on Robitussin DM (cough) 1/2 teaspoon every 6-8 hours. You can buy Robitussin DM over the counter in any pharmacy.
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