behavior
Redirected aggression
How it happens
The animal enters a high-arousal state and the frustration of being unable to reach the trigger reaches a threshold. The nearest available target — a bonded housemate, the owner reaching to intervene — receives the attack. Cats in particular can remain in that aroused state for hours, meaning the second attack can happen long after the original trigger left.
What to do in the moment
- Do NOT reach in or try to pick up an aroused cat. Separate rooms first, hands second.
- For dogs, drop the leash if safe and use a barrier (car door, gate) between the dog and its housemate.
- Leave the aroused animal alone in a dark quiet room for several hours to decompress.
- Reintroduce with counter-conditioning, not by 'showing them they're friends.'
Why it matters
Most owners interpret the attack as 'sudden' aggression toward a housemate and consider rehoming. Recognizing it as redirected — not directed — aggression is what makes the case treatable.
Frequently asked questions
- How long should I keep the cats separated?
- Behaviorists typically recommend 24–72 hours minimum for a mild event, and days to weeks — with formal reintroduction protocol — for a severe one.