My cat has been diagnosd with atrial septal defect. He has no clinical signs of cardiomyopathy, the only reason he was diagnosed with ASD was because we had an echocardiogram and ultrasound after my cat's biologial sister died suddenly of a heart attack a few weeks ago.

Anyway, my cat has been coughing once in awhile for the past few years, ever since we moved to CA. My vet thinks this is from allergies since he never did this in the 8 years we lived in MI. But I've read that coughing could be related to heart problems. Have you ever had experience with cats that cough? He probably does it once every few weeks and usually it's in the middle of the night. Most of the time he follows coughing with vomiting clear fluid. It's not that I don't trust my vet that it's allergies, but I just wanted a second opinion.

Thanks

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