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Hi, I'm sorry to hear that Bella isn't doing well. What kind of cat is she? How long ago did the symptoms start? Is there any chance she could have gotten into anything toxic? Does she have any medical history? On any meds? Is she an indoor only cat?
Does she have a history of having a heart murmur? Based on what you are describing, I'd be worried that her heavy breathing and drooling could be related to a problem with her heart. Alternatively, she could be breathing heavily due to severe gastrointestinal distress. It would definitely be safest and prudent to take her into the nearest emergency hospital tonight for evaluation. It is never normal for a cat to breathe heavily and/or pant. If she is also acting lethargic, I'd be much more worried about heart disease- particularly if she seemedcompletely nornal to you earlier in the day. Hope this helps and please let me know if you have any other questions or can describe any other symptoms that may help me to better delineate what is going on with your little Bella. - Dr. C