An 8-year-old male intact Japanese Chin, presented to the Cornell University Soft Tissue Surgery Service for evaluation of mitral valve insufficiency and to schedule possible mitral valve repair. The patient was first diagnosed with mitral valve degeneration in the spring of 2014 when he collapsed on a run and had multiple coughing episodes. Once diagnosed, he was started on medications (Furosemide, Pimobendan, Enalapril) to help stave off any clinical signs of congestive heart failure, the inevitable cause of his eventual decline. His remarkable owner sought other options and through a series of fortunate events, was able to schedule mitral valve repair surgery. The patient was placed under cardiopulmonary bypass and his chordae tendinae were repaired and his mitral annulus tightened in order to recreate coaptation between his mitral valve leaflets, preventing any further regurgitation. The patient recovered uneventfully from surgery, cardiopulmonary bypass, and anesthesia and was monitored in the ICU for one week. He was placed on low molecular weight heparin, Cephalexin and discharged with a month supply of Plavix. This paper will discuss the surgical approach to repairing a mitral valve during cardiopulmonary bypass as underwent by this particular canine patient, his recovery, prognosis and general information about mitral valve disease.