Glossary
Redirected aggression
A sudden attack on a nearby person or pet by a cat that is highly aroused by something it cannot reach.
Also called: redirected attack, redirected arousal
Redirected aggression happens when a cat becomes intensely aroused by a trigger it cannot get at, and then turns on whoever or whatever is closest. The trigger might be a stray cat seen through the window, a loud noise, a fight between two other pets or being held when it wanted to get away. The victim, who did nothing wrong, may be bitten or scratched badly, and the cat may seem a stranger.
A cat in this state can stay worked up for minutes or even hours, and sometimes days. Warning signs include dilated pupils, flattened ears, a lashing tail, a growl and piloerection, see piloerection.
Do not try to touch, scold or comfort the cat. Walk away quietly, leave it in a dim, calm room with food, water and a litter box, and let it settle for as long as it needs. Stay apart from any cat it attacked until both are relaxed, since a hasty reunion can leave the pair enemies. Block the cat's view of the trigger with film on the window. If it recurs or injures anyone, ask your vet for advice or a behaviour referral. Pain can also lower a cat's tolerance.
Last reviewed November 7, 2026