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I am sorry to hear there is a problem with Winnie's heart. My name is Rebecca I am a veterinarian and will do my best to help.
The prognosis depends on what is wrong with her heart that is causing the enlargement and her rapid breathing. Does she have a heart murmur, was that mentioned? The cardiologist will do an echocardiogram, which will probably tell what the problem is and once the exact diagnosis is made, the best treatment and the prognosis will be known.
This could be a congenital defect such as PDA (patent ductus arteriosis) where a vessel that was supposed to close at birth (called the ductus arteriosis) remained open (or "patent"). It could be a defective heart valve or a problem with the heart muscle itself.
When do you see the cardiologist?
How is Winnie doing?