Cat Aggression in Multi-Cat Households

Aggression between cats in shared households is a major welfare problem and a leading reason for relinquishment to shelters. Understanding feline social behaviour is key to prevention and management.

Key Facts

Cats are a solitary species that tolerates rather than seeks group living — cohabitation requires careful management
Inter-cat aggression is the most common behavioural problem seen in feline veterinary practice
Redirected aggression — triggered by an external stimulus but directed at a housemate — is frequently misdiagnosed
One litter tray per cat plus one additional is the recommended minimum to reduce conflict over resources
Pheromone diffusers (Feliway MultiCat) have evidence-based support for reducing inter-cat tension

Welfare Considerations

Chronic low-level conflict between cats in shared households — staring, blocking, resource guarding — causes ongoing stress that owners often miss. Cats rarely make noise during social tension; signs include hiding, reduced appetite, over-grooming, and inappropriate elimination. The key intervention is resource abundance and distribution: multiple feeding stations, water points, litter trays, resting spots, and escape routes remove the resource scarcity that drives conflict. Gradual introductions are essential when adding a new cat.

What You Can Do

Ensure multiple feeding, water, and litter stations positioned away from each other
Use room dividers and gradual introduction protocols when adding a new cat
Consult a feline behaviour specialist if aggression escalates to physical injury
Consider whether the household cat number is compatible with available space and resources