Because my dog interacts with other dogs a lot, when he developed a "cough" I immediately took him to the vet. He had no fever, is eating and drinking normally and his activity level is normal - he doesn't at all act like a sick dog. I have kept him away from other dogs to avoid getting them sick. The vet diagnosed him with kennel cough and put him on Doxycycline 100 mg - he takes 1 1/2 pills twice a day. He started them on Tuesday.He has also had a Bordetella vaccine. His cough seems to be getting worse instead of better. We cut our walk quite short this morning because he was really coughing and coughing up a lot of phlegm (gray and pale yellow). I'm concerned that he may be getting worse though he still doesn't act sick.
It would probably be best to take your dog back to the vet for chest X-Rays to make sure that he is not developing pneumonia. Especially since your dog's cough has evolved from a dry cough to a productive cough with colored phlegm. He may need an additional antibiotic, cough medication, and additional diagnostics such as a culture and sensitivity or a transtracheal wash.
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