The common domestic cat blood types are A and B, and a third rare type "AB". A DNA test is available to determine a cat's blood type. Blood typing is necessary to avoid problems of incompatibility both in mating of sire to dam, or if there is a need for a transfusion.
As breeders, when we acquire a new kitty, we worry about introducing ringworm, intestinal parasites, or upper respiratory viruses into the cattery. But how often do we remember the silent, but oh so deadly, Feline Leukemia Virus (FeLV)?