Do animals have different blood groups
           Blood group or blood type refers to the classification of blood. This classification is based on the presence or absence of  antigenic inherited substance which is found on the surface of red blood corpuscles.[1] The genes inherited from his/her parents determine an individual’s blood type by causing the presence or absence of the antigens which may be proteins, carbohydrates,glycoproteins, or glycolipids, depending on the blood group system.[2] The two most important blood group systems in humans are  ABO and the RhD antigen.
             In the case of incompatible blood transfusion between a donor and a recipient,  transfusion reactions such as severe acute hemolytic reaction with hemolysis (RBC destruction), renal failure and shock is likely to occur, and even death is a possibility.[3]

             Similarly in animals depending on the presence of inherited antigenic substances, animals have different blood types. And as in humans, incompatible blood transfusion in animals can lead to transfusion reactions.
             For eg canine blood types are denoted as DEA(Dog Erythrocyte Antigen) and the major ones are classified as DEA 1.1, DEA 1.2, DEA 3, DEA4, DEA5, DEA7 and DEA8. While feline blood groups are classified into three A, B and AB.[4][5] and in cattle 10 blood group  systems namely A, B, C, FV, J, L, M, SU, Z and R’S’ has been identified.[6]
             Every animal species has different cell surface systems on their red blood cells and therefore blood transfusion is species specific, so dogs can only give to dogs and cat only to cats.