What is DCM and is it life-threatening in dogs?

DCM is a condition that results in an enlarged heart. As the heart and its chambers become dilated, it becomes harder for the heart to pump and heart valves may leak, leading to a buildup of fluids in the chest and abdomen. DCM will lead to congestive heart failure if left untreated. In some dogs, heart function may improve with appropriate veterinary treatment and dietary modification, if caught early.