PeeWee was referred to our cardiologist for evaluation of labored breathing and a heart murmur. An echocardiogram found that he had Mitral valve degeneration, the most common acquired heart disease in small breed dogs which typically progresses slowly over time. In PeeWee’s case, this also resulted in Congestive Heart Failure. He was hospitalized overnight for treatment and monitoring, his breathing normalized, and he was able to go home the next afternoon.