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Hi, I'm Dr. Peter. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
1- How much does he weigh?
2- Is he on any medications?
3- Any pre existing medical conditions?
In response to your question, you can give him Robitussin DM (cough) 1/2 teaspoon every 6-8 hours. Do not give sugar-free. It is important to remember that a cough could be a sign of a respiratory infection, underlying heart disease, etc. I would also recommend a hands-on examination with your family veterinarian.
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