The patients should be hospitalized and Furosemide given at a bolus of 4 mg/kg, followed by a 1 mg/kg/hr CRI. The use of Dobutamine as a CRI, starting at 2.5 microgr/kg/min is recommended, particularly if the clinical signs are consistent with low output heart failure (paleness, weakness) The dosage can be increased to 5 microgr/kg/min if necessary. If arrhythmias develop, the dosage should be reduced by 50%. Once the patient tolerates pilling, Dobutamine can be replaced by oral Pimobendan. Oxygen should be provided. An ECG should be performed to rule out significant arrhythmia. Once the patient is stabilized, a Holter-ECG is recommended in order to assess the risk of sudden cardiac death and the necessity for antiarrhythmic treatment. Once the pulmonary edema has resolved, oral therapy should include Pimobendan (standard dosage), an ACEI and Furosemide (e.g. 3mg/kg bid). The dosage of Furosemide can then be adjusted based on clinical findings (respiratory rate) and repeated radiographs. Antiarrhythmic drugs should be given as needed. The long-term prognosis is bad, the mid-term prognosis is guarded. Sudden cardiac death can occur at any time.