Hypervitaminosis A in Cats: Diet-Related Bone Disease

Excessive vitamin A from raw liver diets causes painful skeletal deformities in cats, making dietary variety and balance essential for feline health.

Key Facts

Cats fed predominantly raw liver develop vitamin A toxicity due to liver's extremely high vitamin A content
Excess vitamin A causes cervical spondylosis - bony fusion of the neck and forelimb joints
Signs include neck stiffness, reluctance to groom, reluctance to jump, and forelimb lameness
The condition develops slowly over months to years of excessive liver intake
Radiography reveals characteristic bony exostoses fusing the cervical vertebrae
Removing excess liver arrests progression but established bony changes are irreversible
Liver should comprise no more than 5-10% of a cat's diet as an occasional treat

Welfare Considerations

Hypervitaminosis A causes chronic, progressive pain from bony fusion of joints. Affected cats cannot groom themselves, lose mobility, and experience persistent musculoskeletal pain. The condition is entirely self-inflicted through well-intentioned but uninformed feeding practices. Cats love the taste of liver, which makes it easy to overfeed. This preventable disease serves as a reminder that raw food diets require careful nutritional planning, not just ingredient choice.

What You Can Do

Limit liver to no more than 5-10% of your cat's diet as an occasional treat
Feed a complete commercial diet or a nutritionally balanced home-prepared diet
Consult a veterinary nutritionist before feeding homemade or raw meat diets long-term
Have any cat showing neck stiffness or reluctance to groom assessed for skeletal changes
Inform other cat owners about the risks of raw liver feeding