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Hi this is Dr. Hill. Please give me a moment to type my full response. thank you
A bad odor to the breath typically indicates an infection or severe inflammation in the mouth. Because Beau also has a significant cough, I would be concerned about an upper respiratory infection and less likely a mild pneumonia. Was there any odor at all before he started coughing? There is the possibility that he has dental issues and has developed kennel cough on top of the dental disease.
If you have not already, take a look in his mouth at the outside of the teeth on both sides. If anything looks abnormal, then please send a picture.
So it is likely that she has some dental disease and may not have a respiratory irritant or an infection. I was not trying to concern you, I apologize. I just wanted to cover the possibilities. It is a great idea to have her evaluated by your local veterinarian. Please ask any follow up questions. You can continue posting on this thread for several days, even after rating my response. Take care.