My cat’s been indoors for years, but she's suddenly acting feral, hissing and swatting. Why would she do this?

This morning, my cat, who's been an exclusively indoor companion for years, suddenly started acting like she was feral. She’s been hissing and swatting at me whenever I get near her, which is so unlike her usual affectionate behavior. I'm really concerned and confused — could something be bothering her, or is there another reason for this change in behavior?

Answer

It sounds like your usually affectionate cat is experiencing a sudden change in behavior, becoming aggressive and distant. This can be concerning, but several factors could be influencing her actions.

  • Sudden behavior changes may indicate a health issue.
  • Environmental changes can affect a cat's mood and behavior.
  • Consulting with a vet can provide clarity and peace of mind.

When a cat who is normally friendly suddenly becomes aggressive, it can sometimes signal underlying health problems such as pain, illness, or stress. It's also possible that something in her environment has changed, causing her distress—this could be a new pet, unfamiliar scents, or even construction noise. Assessing any recent changes in her surroundings or routine is key. Since cats are masters at masking discomfort, it might be best to consult a veterinarian to rule out medical causes.

Book a consultation with a licensed vet at Dial A Vet for just $49 AUD if you're unsure or symptoms are getting worse.

Frequently Asked Questions

  • Why is my indoor cat suddenly aggressive?

    Sudden aggression in cats can be attributed to stress, changes in the environment, or undiagnosed medical conditions. Have there been any changes in the household that might be upsetting her?

  • Could this behavior be due to a medical issue?

    Yes, cats might act out of character if they're in pain or unwell. Conditions such as dental pain, arthritis, or a urinary tract infection could cause aggression or withdrawal.

  • What steps can I take to help my cat return to her usual self?

    Begin by observing her environment for potential triggers. Providing her with a safe, quiet space and maintaining a routine can help reduce stress. Consulting a veterinarian to rule out health issues is also a good step.

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