Aggression between cats is one of the most common and distressing behavioural problems in multi-cat households. Understanding its causes and implementing evidence-based management strategies can dramatically improve feline welfare.
Chronic inter-cat aggression causes significant and often underappreciated welfare harm. The victim cat may live in a state of persistent fear and stress, restricting its use of the home, hiding frequently, and developing stress-related health conditions such as feline idiopathic cystitis (FIC). Owners often misread conflict signals, interpreting chasing as play or missing subtle signs of intimidation at resource areas. The aggressor cat is not simply "dominant" — it is often anxious itself, controlling resources because of insecurity. Environmental modification addressing resource distribution, spatial complexity, and vertical space is the evidence-based foundation of management. In some cases, incompatible cats should be permanently separated or rehomed for the welfare of both animals. Rehoming should not be seen as failure — it is sometimes the kindest outcome. Veterinary referral to a feline behaviourist is recommended for persistent or escalating cases.