How Long Will An Older Cat Hiss At a Kitten?

When you introduce a frisky, energetic kitten into a household with an older, settled cat, it’s natural to anticipate some tension. The hissing sound, that seemingly aggressive, snake-like noise, is an older cat’s instinctual way of setting boundaries with the newcomer. But how long can you expect this hissing to last? Let’s explore the dynamics between older cats and kittens and understand the timeline of their relationship development.

Why Do Older Cats Hiss at Kittens?

  1. Territorial Instincts: Cats are naturally territorial creatures. An older cat has likely established a set space as “theirs” in your home. The introduction of a new kitten can be perceived as an invasion of their territory, prompting defensive behaviors such as hissing.
  2. Overstimulation: Kittens are known for their boundless energy. This can be overwhelming for an older cat who is used to a calm environment. The constant playfulness and intrusion into their personal space can be too much, causing the older cat to hiss in response.
  3. Uncertainty and Fear: Despite their aloof reputation, cats can be quite sensitive to environmental changes. A lively kitten’s sudden appearance can shock an older cat, and their hissing might be a way of communicating their discomfort.

The Timeline of Acceptance

  1. First Few Days: This is when you’ll likely hear the most hissing. The older cat is still trying to understand the new addition to the family, and the kitten is often too curious for its own good. It’s essential to monitor their interactions but also give the older cat space and time to adjust.
  2. One to Two Weeks: By this time, the frequency of hissing should reduce. The older cat will start to recognize that the kitten is here to stay, and the kitten might begin to understand the boundaries set by its elder.
  3. After a Month: Most cats will have settled into some form of acceptance by this point. While occasional hissing can still occur, especially if the kitten oversteps, it should be far less frequent.
  4. Extended Period: Some cats might take longer to accept the new member, and that’s okay. Factors such as the older cat’s temperament, past experiences, and the specific dynamics between the two cats can extend the hissing period.

Tips to Smooth the Transition

  1. Gradual Introduction: Instead of allowing the cats to meet face-to-face immediately, initially keep them in separate rooms. Let them get used to each other’s scent by swapping bedding or toys. This helps in reducing the surprise factor.
  2. Safe Spaces: Ensure that the older cat has places it can retreat to when feeling overwhelmed. Cat trees, high shelves, or separate rooms can offer a sanctuary.
  3. Positive Reinforcement: Reward both cats with treats and praise when they interact without aggression. This encourages good behavior.
  4. Monitor Play: Ensure playtime doesn’t get too aggressive. If the older cat seems stressed, separating them and giving each some alone time is crucial.
  5. Consult a Vet or Expert: If hissing continues for an extended period or if you notice aggressive behavior, it might be worth consulting with a veterinarian or a feline behavior specialist. They can provide guidance tailored to your cats’ specific needs.


While the hissing sound can be concerning for pet owners, understanding the reasons behind it and giving both cats time to adjust can help foster a harmonious relationship. Remember that every cat is unique, and patience is vital. With the right approach, the hissing phase will be just a short-lived memory in a long, loving relationship between your feline companions.

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