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Hello and thank you for asking your question. My name is***** will try to help.
Can you tell more about the cough please?
1. When did it start?
2. Does he have any nasal drainage or sneezing?
3. Is he coughing up phlegm?
4. Is he having trouble breathing?
He does it off and on...some times there's phlem...no trouble breathing . ..no drainage
When did it start?
Is he on heartworm prevention?
Yes . .off and on a few months
Ok if it has been a few months then he needs to have a chest x-ray done.
Heart disease can cause a chronic cough. If the heart does not pump blood out as it should the fluid backs up into the lungs and can cause a chronic cough. There are medications to remove fluid from the lungs and help the heart work more effectively.
He could also have chronic bronchitis which could be seen on the x-rays as well.
Sometimes dogs have tracheal collapse where the cartilage rings in the trachea collapse when the air pressure changes. That causes an intermittent cough.
You can try giving him plain Robitussin cough syrup with the active ingredient "dextromethorphan."
1 teaspoon per 10 pounds of dog every 6 hours as needed.
But I do thinks he should have a chest x-ray done to rule out heart, trachea, and lung issues.
Does that help? Do you have any additional questions?