Also congenital mitral valve disease.
Eventual outcome is likely to be congestive cardiac failure.
Common in Cavalier King Charles, Chihuahua, Miniature Poodles, Minaiture Schnauzer and Pekingese. Chest radiographs should be obtained and a proper clinical assessment carried out before assuming the diagnosis. Lateral and DV radiographs should be obtained to look in particular for left atrial enlargement, pulmonary oedema or pleural effusion.