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I am sorry to hear you are worried about your DeeDee. My name is Rebecca. I am a veterinarian and will do my best to help.
Did this come on suddenly? If it did, this is probably "kennel cough" or infectious tracheobronchitis. She does not have to go to a kennel to get it. I have been seeing a lot of it lately.
If she is eating normally, and her gums are pink in color, and came on suddenly, a course of antibiotics should help her. You can also give her Robitussin DM (only the DM form), 1/4th of a teaspoon up to 4 times daily, but if this is kennel cough, she should see your veterinarian for some antibiotics.
Other possibilities that cause coughing in small dogs are heart disease and a collapsing trachea, but these tend to come on slowly and gradually get worse.
Let me know if this is helpful and what else I can answer. Rebecca
I hope you could see my answer; what else can I help with?