The Appearance of cardiac tumors in domestic animals generally is not often, except in the dogs. Cardiac tumours can be either primary or secondary and benign or malignant. Because of it's relatively high frequency and high mortality rate, cardiac hemangiosarcoma is the most important neoplasia in the dogs. In addition to cardiac hemangiosarcoma, the second commonly reported heart tumours are aortic body tumours (chemodectoma and paraganglioma) and many others. Hemangiosarcoma is a malignant neoplasm of vascular endothelial origin. Chemodectoma and non-chormaffin paragangiloma are synonyms which are used to describe neoplasms which arise from chemoreceptor organs. In this study, incidence of cardiac tumors in dogs and its connection with age, breed, sex and locatlization in eight year period (1st of January 2009 - 31st of December 2017.) was investigated. Tumors and animal carcases were analyzed at the Department of veterinary pathology in Zagreb where 105 cardiac tumors from 103 dogs were diagnosed. In group of 103 dogs, most commonly affected breeds with cardiac tumors were mongrels, german shepherd, german boxer, labrador retriver and golden retriver. Average age of dogs affected by cardiac tumor was 11 years with range from 3 to 15 years. Male dogs were more frequent to cardiac hemangiosarcoma (61%) and for chemodectoma, there was no difference in incidency of tumors regarding sex. The most common site of cardiac hemangiosarcoma was right atrial appendage (64,82%), and in chemodectoma was base of the heart (55,17%)