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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
It sounds like this may be pneumonia. In that case, I don't like to use cough suppressants. I typically treat my pneumonia dogs with a combination of Clavamox + Baytril (Enrofloxacin). I will also nebulize saline and coupage them every 4-6 hours. Most take 2-3 days in the hospital and then they go home once stable.
If you're able to post the x-rays here, I would be happy to look at them for you.
Otherwise, you may want to get a second opinion to nail down the diagnosis and treat a little more aggressively.
I hope this helps, let me know if you have any other questions.