DEFINITELY have a chest x-ray done if there is coughing which isn't easily traced back to something like a case of influenza which is NOT thought by your vet to have possibly worsened in pneumonia in that individual. You NEED to know up-front if you might be dealing with cardiomyopathy, pneumonia, pleurosy (very rare but we've had one with it, -- x-rayed and ultra-sounded), etc. since these are serious conditions but their damage (or rate of damage) can be stopped or slowed with RAPID appropriate care. The vet may also want to do a head x-ray (in case there's a possibility of a growth in a sinus contributing) or other testing as well. As you all should know by now, but which bears repeating -- we are not vets, just owners with long experience. [Posted in FML issue 2865]