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  I have a similar problem- my boy only coughs some at night when he is getting ready to go to sleep. I took him to the vet, of course he didn't cough at all, his lungs were clear, his thoat appeared to be fine- everything checked out normal. I don't know what it is- allergies maybe? I am thinking maybe he is allergic to something that is in my bedroom or bathroom?? I can't figure out what is different in that room from all the others...
 Sorry I can't help you, I just wanted to mention that I am having the same problem. If you figure it out, please share!
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