Hi there,
I will do my best to answer your question. Ronaxan is a different form of antibiotic called doxycycline. It is often used for either kennel cough or for various tick borne diseases such as Lyme Disease. It should not cause a patient to cough more; if the reason that he is coughing is bacterial in origin it should actually help decrease his cough. I would suggest that if this antibiotic does not help, x-rays of the chest may be indicated to ensure that there isn't something else going on. Blood work may also be helpful. Other considerations in his case include heartworm disease, primary heart disease, neoplasia, bronchitis, or allergies.
I hope this information helps,
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