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I am sorry to hear you are worried about Charlie. My name is Rebecca. I am a veterinarian and will do my best to help.
A dry cough could be from his inhaling something irritating (pollen, dust, dirt), or the beginning of a respiratory infection. If it is some irritant, it should stop in a little while. If it gets worse, it may be an infection.
If he is eating and drinking, I would monitor him for now. If he is still coughing tomorrow, if the cough gets worse, or if Charlie stops eating, I would have him checked out to see if he needs antibiotics.
You can give a puppy 1/4th teaspoon of Robitussin DM (no other than the DM formula) for coughing if needed.
Let me know if this is helpful and what else I can answer.
I hope you were able to see my response; I have not heard back from you! How is Charlie doing? Was this helpful; did I answer all your questions?