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Hello. Thanks for the question.
The coughing could be one of a few things. It could be heartworm disease, kennel cough, bronchitis, pneumonia, heart disease or lung cancer.
You really need to start with an exam to listen for a heart murmur and noises (crackles or wheezes) in the lungs. That helps to narrow down the list. I would also run a heartworm test if she is not on year round heartworm preventative. Lastly, I'd shoot x-rays of the lungs. That should nail down the diagnosis.
For now, you can give an over the counter anti-tussive at home. Robitussin DM is safe in dogs. You can give 1 teaspoon orally every 8-12 hours, as needed.
I hope this helps, let me know if you have any other questions.