dilated cardiomyopathy (DCM) is one of the most common acquired cardiovascular diseases in dogs. Although few studies of the prevalence of DCM in the overall population of dogs have been reported,estimates range from 0.5% to 1.1%. Only degenerative valvular diseaseand, in some regions of the world, heartworm infection are more common
causes of cardiac morbidity and mortality in dogs. DCM is seen most commonly in large and giant breeds of dogs, although its frequency seems to be increasing in medium-sized breeds, such as the English and American cocker spaniels.
It has been reported rarely in small and miniature breeds of dogs