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Why is my cat suddenly aggressive, hiding, and eating constantly?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Longhair | Female | spayed | 3 years and 9 months old

Hi. I have 3 cats. One I introduced 2 years after getting the first 2. The 3rd has become very withdrawn and acting aggressively, one of my older ones chases her and seemingly plays but she reacts very aggressively with hissing and retires to a hidden place. This only started recently since moving, but we moved 12 months ago. She also can act aggressively with me which never used to be the case. She's also very vocal wanting food and all she seems to want to do is eat. Tried feliway, no luck

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1 Answer

Most Helpful Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on January 4th, 2019

Sudden aggression and behavior changes in cats can sometimes indicate pain or underlying illness. I would make sure to schedule a vet checkup to rule out any health issues that could be causing the behavior. If she checks out healthy, making sure all of the cats have their own access to food, water, litter, bedding, places to hide, etc can help decrease inter-cat tension. Spending some time with each, and giving your cat a break if she becomes too irritated or agitated may help as well. If the behavior persists or worsens, speaking with a trainer or behaviorist in person is a good next step as well.

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