The reason why British Shorthair cats are prone to sudden death is because British Shorthair cats are prone to genetic diseases. The more common one is heart disease, especially male cats, which are more likely to inherit heart disease, so British Shorthair cats are prone to sudden death. When a cat suffers from heart disease, he or she will generally experience coughing, inactivity, shortness of breath, weight gain, behavioral changes, etc. Once a cat is found to have these symptoms, it is best to send it to a pet hospital for examination in time.