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My name is***** and I am sorry Katy is not feeling well. I am very concerned about any cat that is open mouth breathing. What did the vet say when they say her a couple of days ago?
Unfortunately, open mouth breathing can be caused by many things. It could be anything from asthma, to heart disease, to pneumonia. She definitely needs to be seen again by your vet. Did they take any x-rays at that time? Did they prescribe any medications?