<P> The rhesus system is named after the rhesus monkey, following experiments by Karl Landsteiner and Alexander S. Wiener, which showed that rabbits, when immunised with rhesus monkey red cells, produce an antibody that also agglutinates the red blood cells of many humans . </P> <P> Data on blood groups of chimpanzees, baboons, and macaques . Two complex chimpanzee blood group systems, V-A-B-D and R-C-E-F systems, proved to be counterparts of the human MNS and Rh - Hr blood group systems, respectively . Two blood group systems have been defined in Old World monkeys: the Drh system of macaques and the Bp system of baboons, both linked by at least one species shared by either of the blood group systems . </P> <P> Over 13 canine blood groups have been described . Eight DEA (dog erythrocyte antigen) types are recognized as international standards . Of these DEA types, DEA 4 and DEA 6 appear on the red blood cells of ~ 98% of dogs . Dogs with only DEA 4 or DEA 6 can thus serve as blood donors for the majority of the canine population . Any of these DEA types may stimulate an immune response in a recipient of a blood transfusion, but reactions to DEA 1.1 + are the most severe . </P> <P> Dogs that are DEA 1.1 positive (33 to 45% of the population) are universal recipients - that is, they can receive blood of any type without expectation of a life - threatening hemolytic transfusion reaction . Dogs that are DEA 1.1 negative are universal donors . Blood from DEA 1.1 positive dogs should never be transfused into DEA 1.1 negative dogs . If it is the dog's first transfusion the red cells transfused will have a shortened life due to the formation of alloantibodies to the cells themselves and the animal will forever be sensitized to DEA 1.1 positive blood . If it is a second such transfusion, life - threatening conditions will follow within hours . In addition, these alloantibodies will be present in a female dog's milk (colostrum) and adversely affect the health of DEA 1.1 negative puppies . </P>

Do dogs all have the same blood type