Acquired heart diseases are common and often fatal when it leads to congestive heart failure in dogs and it occurs most often secondary to degenerative mitral valve disease dilated cardiomyopathy, pericardial diseases and hypertrophic cardiomyopathy. Animals with acquired heart diseases were selected from the animals that were brought to Madras Veterinary College teaching hospital, Chennai, India. One hundred and six animals with acquired heart diseases were selected and grouped as those with dilated cardiomyopathy (DCM), mitral valve disease (MVD), pericardial disease and hypertrophic cardiomyopathy (HCM). The incidence of AHDs was found to be 0.37 per cent (106 out of 28467) in the study period. Labradors and Spitz were found to be commonly affected with DCM and MVD respectively. Older male dogs were found to be more commonly affected with AHDs.