A. How old is your cat ? Is he/she up to date with he vaccinations ? Does she suffer/has been diagnosed with other medical problems ? It could just be that she is opening her mouth to breathe as she can't get enough air through her nose. However it is difficult to tell 100% without all the information and being able to assess your cat properly. Some cats can inhale foreign bodies, some other have nasal polyps, some just have cat flu but in this last case you should see some nasal discharge and runny eyes. I would recommend a consultation.
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