The most common blood type in cats is Type A.
Studies show that Type A is overwhelmingly dominant in domestic cats, with prevalence reaching 94–99% in many populations.
Cats have a unique blood group system that’s much simpler than the human ABO system, but still critically important—especially for transfusions and breeding. Here’s a deeper look at what the research shows:
🩸 The Three Feline Blood Types
Cats have three major blood types:
- Type A
- Type B
- Type AB (rare)
According to veterinary sources, Type A is by far the most common blood type in cats across most regions and breeds. In the United States, for example, up to 94–99% of domestic shorthair and longhair cats have Type A blood.
🧬 Why Type A Is So Common
- Type A is genetically dominant over Type B.
- A cat only needs one copy of the A allele to express Type A blood.
- Type B requires two copies of the recessive B allele, making it much less common.
🐈 What About Types B and AB?
- Type B is uncommon overall but appears more frequently in certain pedigree breeds (e.g., British Shorthair, Devon Rex).
- Type AB is rare in all breeds and is thought to be caused by a third allele.
⚠️ Why Blood Type Matters
Cats have naturally occurring antibodies against other blood types. That means:
- A mismatched transfusion can cause severe, life-threatening reactions.
- Queens and kittens with incompatible blood types can experience neonatal isoerythrolysis, a dangerous condition where the queen’s antibodies attack the kittens’ red blood cells.
Because of this, blood typing is essential before any transfusion or breeding scenario.
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