Transfusion medicine has evolved over time in both human - as well as in veterinary medicine into an integral part in intensive care. The aim of this retrospective study was to provide a brief overview of the various blood products, their application and the risks of transfusion medicine. Furthermore, the administered transfusions were evaluated at the Veterinary University of Vienna in the period from 01/01/2006 to 31/03/2012 in respect of used product and diagnosis. Additionally it should be focused on whether there is an accumulation in the blood group distribution in different breeds. It was differentiated only between DEA 1.1 positive and negative animals, because this is the clinic al most important blood group. In the above period 1733 blood group determinations were performed at the Veterinary University of Vienna. 50.9 % of these were positive for DEA 1.1. The hypothesis being DEA 1.1 positive or negative with a probability of more than 75 % was just corroborated by the Great Danes (3 6 / 40 DEA 1.1 positive) and boxers (18 / 20 DEA 1.1 negative). All in all 1306 transfusions were administered. The most common used product was plasma (48.9 %), followed by whole bloo d (39.7 %) and PCV (10.9 %). The most frequently diagnoses were parvovirosis (267), anaemia (208, 49.5 % IMHA), neoplasia associated bleeding (141) and panc reatitis (120). In cases of pancreatitis and parvovirosis the most common used product was plasma with 87.5 and 88.0 %. These results corroborated the fifth hypothesis of this study. With a view to the use of PCV the hypothesis that PCV is most frequently used in patients with IMHA was approved. In cases of IMHA and neoplasia associated bleeding the most commonly used product was whole blood. This result corroborated the last hypothesis of this study.