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Hello. I am sorry to hear that Your boy has you worried. My name is ***** ***** I would be happy to help.
If he was wearing a harness and not a regular collar then we would not be to worried about the trachea. The coughing/honking noise is often associated with a condition called a reverse sneeze. This is normally not anything to worry about and can be cause by anything at irritates the soft pallet such as pollen, dust, water, etc. If it happened again when he went out today with no harness then I would be suspicious that there may be a high pollen count in your area right now.
You could try a little Benadryl or Zyrtec to see if this helps. Benadryl is dosed at 1mg per pound of body weight every 12 hours. Zyrtec at 0.5mgs per pound once daily.
This type of cough can also be associated with kennel cough and in a senior dog we worry that coughing could be the first sign of heart disease. If the problem gets worse or you do not see any change with the allergy meds then I would have him seen by a vet for a hands on exam.
I hope this helps give you some direction.
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