When Will My Cat Stop Hissing at New Kitten? Tips for a Smooth Introduction Process

Introducing a new kitten to an older cat can be an exciting and rewarding experience for pet owners. However, it can also be a stressful and sometimes difficult process. One common issue many pet owners face during this time is the older cat hissing at the new kitten. In this article, we will discuss when your cat may stop hissing at the new kitten and provide helpful tips to make the introduction process as smooth as possible.

Understanding Cat Behavior

Before we discuss the introduction process, it’s essential to understand why your older cat may be hissing at the new kitten. The behavior can be attributed to several reasons, including territorial, socialization, and fear-based behavior.

Territorial behavior is common among cats, involving a cat protecting its territory from potential threats. When introducing a new kitten, your older cat may perceive the new kitten as a threat to its territory, which can cause hissing and growling.

Socialization behavior is also common among cats, involving cats interacting with each other and developing relationships. If your older cat is not properly socialized, it may not be accustomed to the presence of other cats and may exhibit aggressive behavior toward the new kitten.

Fear-based behavior is another reason why cats may hiss at new kittens. Unfamiliar scents or sights can trigger fear and cause a cat to become defensive and display aggressive behavior.

Steps to Introduce a New Kitten to an Older Cat

To ensure a smooth introduction process and help your older cat stop hissing at the new kitten, it’s essential to follow a few steps. These steps include:

Separation:┬áThe first step in the introduction process is to separate the new kitten from the older cat. This can be done by placing the new kitten in a separate room containing food, water, and a litter box. This allows the older cat to become accustomed to the new kitten’s scent without feeling threatened.

Scent swapping: Once the new kitten and older cat are separated, you can begin swapping. This involves rubbing a towel or cloth on the new kitten and placing it near the older cat’s food and water bowls. You can also rub a towel or cloth on the older cat and place it near the new kitten’s food and water bowls. This helps both cats become accustomed to each other’s scents.

Visual introduction: Once both cats are comfortable with each other’s scents, you can begin a visual introduction. This involves allowing the cats to see each other through a baby gate or a cracked door. This allows the cats to become familiar with each other’s appearance without direct contact.

Supervised interaction: Once the cats are comfortable with each other’s scents and appearance, you can begin supervised interaction. This involves allowing the cats to interact with each other while under close supervision. Supervising their interactions is vital to ensure no aggressive behavior occurs.

Signs of Progress in the Introduction Process

During the introduction process, it’s important to watch for signs of progress in your cats’ behavior. These signs can indicate that your cats are becoming more comfortable with each other and that the introduction process is working. Some signs of progress include:

Decreased hissing and growling: As your cats become more comfortable with each other, they may hiss and growl less frequently.

Curiosity towards the new kitten: Your older cat may begin to show more curiosity towards the new kitten, approaching them without hissing or growling.

Playful behavior: As your cats become more comfortable with each other, they may begin to play and interact with each other playfully.

It’s important to remember that the introduction process can take time, and progress may take time. Patience is critical during this process, and it’s important to avoid rushing your cats or forcing them to interact before they are ready.


Introducing a new kitten to an older cat can be a rewarding experience for pet owners but also stressful. Hissing and growling are common behaviors that older cats may exhibit when introduced to a new kitten, but understanding cat behavior and following the proper steps for introduction can help ease the process. It’s important to remember that progress may take time, and patience is critical during the introduction process. With the proper care and attention, your cats can become great companions and enjoy a long and happy life together.

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