This case study examines the diagnosis, treatment, and complications associated with right-sided heart failure secondary to severe tricuspid dysplasia in a 4.5 year old intact female American Bulldog. She presented after a one week history of abdominal distension, inappetance, severe weight loss, and an rDVM reported arrhythmia. On presentation she was bright and alert but severely cachexic with an orthopneic stance. After our initial physical exam the patient’s problem list included cachexia (BCS 2/9), orthopnea, abdominal distension, tachycardia, an irregularly irregular rhythm, grade II/VI bilateral systolic heart murmurs, and weak, varying intensity pulses. By implementing diagnostic tools such as routine blood work, echocardiogram, electrocardiogram, and abdominocentesis we were able to work though the differentials for the patient’s condition and establish a diagnosis. A palliative therapeutic plan was then developed which the patient responded to favorably.