The blood is a living tissue, which is a unity consisting of extremely specific structures, each having a separate function. Both blood components and plasma fraction products should be considered when referring to blood products. In the last 25 years in veterinary medicine, blood transfusions have become a routine and frequent life-saving practice for sick or injured animals, rather than a relatively rare occasion. Although component therapy has not yet become prevalent in the veterinary medicine, veterinarians have now become aware of the importance of using not only the whole blood but also the blood components in blood transfusions, since the information on blood component therapy has become more widespread in the recent years. In veterinary medicine, the blood transfusion may be performed when erythrocyte replacement, hemostatic protein replacement, non-hemostatic protein replacement, and platelet replacement are required. In transfusion, the blood components such as fresh whole blood, stored whole blood, fresh frozen plasma, plasma, cryoprecipitate, cryoprecipitate-poor plasma, platelets-rich plasma can be used according to the indication.