Companion Animal Welfare

Cat Hypervitaminosis A: Prevention and Treatment

Chronic overconsumption of vitamin A causes severe skeletal pathology in cats, a preventable welfare concern linked to raw liver diets.

Key Facts

Cats fed raw liver more than once or twice weekly are at risk of vitamin A toxicity
Excess vitamin A causes new bone formation, particularly in the cervical spine and elbows
Affected cats develop a characteristic hunched posture and reluctance to move
Diagnosis is confirmed by radiography showing bony fusion and exostoses
Prognosis depends on severity — early intervention before bone fusion yields better outcomes

Welfare Considerations

Hypervitaminosis A is entirely preventable through diet management. Cats fed raw or home-cooked diets must receive nutritionally balanced formulations, not ad hoc combinations of organ meats. Once skeletal pathology develops, it is irreversible, and management focuses on pain relief, anti-inflammatory therapy, and dietary correction to prevent further progression. Owners feeding home diets should work with a veterinary nutritionist.

What You Can Do

Limit raw liver to a maximum of once per week and in small quantities
Feed home-cooked diets only under veterinary nutritionist guidance
Watch for early signs: stiff neck, reluctance to groom face, decreased jumping
Request radiographs if your cat shows unexplained musculoskeletal stiffness
Choose AAFCO-certified commercial diets formulated for nutritional completeness