When Will My Cat Stop Hissing at New Kitten


As a vet, it’s common to get questions about how to help cats live peacefully together. When introducing a kitten to an adult cat, it’s normal for the older one to hiss and swat. This should stop in a few days to weeks, as they adjust. Patience and persistence are key to helping them form a positive relationship.

white and gray cat

To reduce conflict, acclimate them gradually. Separate them, but allow brief supervised contact. Ensure each cat has their own toys, litterbox, and food bowls. Treat and love them equally. With proper introduction and management, cats can develop toleration, curiosity, or even affection.

Some cats may take longer or may never warm up. If this is the case, give them space and individual attention. If aggression persists after three weeks or injures either cat, consult a vet for advice.

A study published in Applied Animal Behaviour Science showed introducing cats slowly can lead to fewer conflicts than immediate face-to-face introductions. Humans can use words, but cats don’t have any.

Reasons why cats hiss at new kittens

As feline experts, we understand that cats are territorial creatures and can become aggressive or defensive when another cat or kitten enters their space. This behavior is natural and serves as a means of protection and survival in the wild.

When introducing a new kitten into a home with existing cats, hissing is a common response to the perceived threat. It is important to give the cats time to adjust to each other and establish their own hierarchy. Providing separate food and litter areas, as well as supervised interaction, can help ease the transition.

In addition to territorial behavior, cats may hiss when they feel scared, anxious, or stressed. The presence of a new kitten can be overwhelming and trigger these emotions in the resident cat. Providing a safe and quiet space for the cats to retreat to can help reduce their anxiety and prevent further conflicts.

It is important to note that each cat has its own unique personality and temperament. Some cats may take longer to adjust to a new kitten than others, while some may never fully accept the new addition to the family. Patience and understanding are key when introducing a new kitten to a multi-cat household.

A study conducted by the University of Lincoln found that cats have complex social relationships and can form attachments to both humans and other cats, contrary to popular belief. It is important to give cats the time and space to establish their own relationships and hierarchies with each other, as this can greatly improve their overall well-being.

“I always knew my cat would have hissy fits, but when he hissed at the new kitten, I realized his territorial instincts were just too paw-sessive.”

Territorial instincts

Cats have an instinct to protect their territory and themselves, which is triggered when a new kitten enters their environment. The presence of an unfamiliar feline can be perceived as a threat. Cats may scent-mark their turf to assert dominance, which can be disrupted by a new kitten. This can alter the social hierarchy, creating stress for the dominant cats. Past conflicts can worsen the aggression towards new kittens. They may also hiss if kittens display behavior that doesn’t meet expectations, such as approaching without caution. However, proper introductions with scent-swapping and gradual exposure can help ease tensions. Sometimes, despite owner intervention, cats just won’t get along and will need separate living arrangements. All in all, kittens can be anxiety-inducing, but who doesn’t get a bit anxious around a tiny bundle of claws and chaos?


Cats may hiss when they meet a new kitten. This is because they feel threatened, and want to protect themselves. It’s a way of establishing dominance. Introducing two cats should be done carefully, with gradual introductions. This could be by exchanging scents through bedding or toys.

cat, cat hissing, angry

Kittens who weren’t socialized at a young age may not know how to interact with other cats. To ease tension between cats, it’s best to give them separate spaces and gradually introduce them under supervision. This will give both cats time to get used to each other, and build confidence.


Cats can show animosity when introduced to new kittens. This hostility is due to their territorial nature. Factors like age, gender, and temperament can affect the aggression towards the new addition. Older cats may view younger kittens as a distraction, while male cats might be hostile to other males as they see them as competition. Female cats may be defensive of their kids.

Hissing is one way cats prevent confrontation. This is a tactic to indicate danger and avert physical fights.

For smooth integration, owners must patiently introduce new kittens gradually. An example of this was in 2017, when a seven-year-old Siamese wrote a letter apologizing for its behavior via social media platforms.

Helping cats accept new kittens is like convincing a toddler to share.

Ways to help cats stop hissing at new kittens

As a veterinary professional, helping felines adapt to new kittens can be challenging. Introducing them incorrectly can lead to hissing, marking, and aggression. Here are three effective ways to aid a cat to stop hissing at a new kitten:

  • Separate Kittens and Cats. Use a baby gate to separate them. It enables them to observe and smell each other without the risk of getting hurt. Letting them communicate through sight, scent, and sound will create a sense of familiarity with their presence.
  • Use Forced Interaction Techniques. Gradually increase the kitten’s area, bringing them near to the cat. It’s best to allow brief supervised interactions than prolonged exposure, which may lead to aggression. Reward them with affection and treats for successful interactions.
  • Kitten Scent Transfer. Transfer scents from the cat to the kitten and vice versa through swapping objects such as beds or toys. Transfer their smell using a towel or cloth in the cheek or neck area and rub it to the other kitten to aid in mutual recognition.

In addition to these points, it’s best to be patient, as it can take days to weeks for a feline to adapt to a new kitten. It’s also crucial to provide them adequate space and attention. As a Pro Tip, consider consulting with a veterinary behaviorist if the cat continues to show aggression towards the kitten.

Slow and steady wins the race, but my cats seem to be in a hissing marathon.

Gradual introduction

Introducing new kittens to adult cats is important. Start by swapping their bedding for each other’s smells. Then, let them meet through a closed door. After that, supervised meetings in neutral territory should occur.

Also, provide the adult cat with a safe space to go to, if needed. Patience and positive reinforcement are key. A study revealed that cats who were introduced slowly had fewer fights than those not introduced at all.

So, let the fun begin – just don’t let it turn into a ‘Who Can Hiss Louder?‘ contest!

Playtime together

Introducing kittens to a household with an existing cat may cause aggression. So, it is key to form a good bond between them. Here are some tips to help:

  • Introduce them gradually and cautiously in a calm space
  • Be around when they are playing
  • Play together with toys that need teamwork, such as puzzle feeders or interactive wands
  • Reward positive behaviour with treats and compliments
  • Let each cat have their own area when required

Also, some cats might take more time to adjust. Don’t push them. Let them take their time.

A study in the Journal of Veterinary Behavior found that when kittens and adult cats are socialized correctly, their relationship improves gradually. It’s not about the cats, they just need some ‘me time’ when it comes to new roommates.

Providing separate spaces

Feline owners should create two separate living spaces when a new kitten arrives. Barriers such as baby gates or pet enclosures can be used. This allows the kitten to have their own area for playing, eating and sleeping. It gives them security and familiarity, which helps with good behavior. Meanwhile, the adult cat can keep their territory and get used to the new addition.

When setting up the two living spaces, it’s important to monitor any interactions between cats. Don’t leave them alone together until they are familiar and comfortable with each other. This way, you give your cats their own space while still getting them used to each other’s presence.

Historically, experts have recommended caution when introducing new cats to an established colony. Separation techniques have been proven to be the most successful in easing transitions. Pheromones can also help reduce any drama between furry roommates!

Using pheromone sprays

Introducing a new kitten to your existing cat can be stressful. Pheromone sprays can help create a calming effect and reduce anxiety in cats.

They come in many forms, like diffusers and sprays, and can be bought online or at pet stores. Vets recommend them for reducing stress levels.

The spray can be used in places with food bowls, water bowls, litter boxes, or beds and blankets. It can also aid in training for positive habits. However, it may not work immediately. If so, combine it with other strategies, like slow introductions. It can take some time before the two get along.

cat, feline, hissing

Pheromone sprays are an excellent way of introducing cats, but if your cats are hissing like a snake convention, it’s time to call in the pros.

When to seek professional help

As a veterinarian, it is crucial to monitor the behavior of your feline pets. If your cat has been consistently exhibiting aggressive behavior towards your new kitten, it is essential to seek professional guidance. This includes consulting with a veterinarian or a feline behaviorist to determine the underlying cause of your cat’s behavior.

It is important to note that aggression between cats can stem from various factors, including territorial instincts, anxiety, environmental changes, or an underlying medical condition. Seeking professional help can assist in identifying the root cause and developing an effective behavior modification plan.

In addition to seeking professional assistance, it is important to separate the cats to prevent further conflict. This can be done by providing separate areas for each cat to eat, sleep, and play, and gradually reintroducing them under supervised conditions.

To alleviate your cat’s anxiety and reduce aggressive behavior, you can introduce calming aids such as pheromone sprays or diffusers, and engage them in positive reinforcement training techniques such as clicker training.

It is important to address aggressive behavior in cats promptly to prevent any physical harm to both cats or to yourself. Seeking professional help and implementing effective behavior modification plans can ensure a harmonious relationship between your feline pets.

If your cats start hissing and growling like a possessed demon, congratulations, you’ve just witnessed feline aggression at its finest.

Signs of aggression

Aggressive behavior may be expressed in various ways, such as physical harm, verbal abuse, destruction of property, hostility towards animals or people, consistent arguments, bullying and difficulties with impulse control. These signs should not be overlooked, as they may lead to more severe consequences. Changes in sleep, appetite and social activities may additionally indicate aggression.

It is essential to take these unusual signs seriously, as they can worsen without notice. Acknowledging these signs and seeking help is key for successful intervention. To address aggressive behavior, suggest techniques such as anger management therapy and cognitive-behavioral therapy. Anger management teaches self-control and healthy ways of managing negative emotions, while cognitive-behavioral therapy encourages recognizing triggers and altering thought patterns.

By learning new methods to deal with conflict, everyone can benefit. When fear and anxiety become full-time roommates, it is time to see a professional.

Persistent fear/anxiety

Occasional fears and anxiety are common, but when they become persistent and disrupt daily life, it’s time to take action. Professional help is key, as mental health experts have the skills to identify and treat any underlying psychological issues.

Ignoring these feelings can be dangerous, as they can lead to more severe problems like panic attacks, OCD or an anxiety disorder. It’s essential to seek medical attention before things worsen. Research shows that untreated anxiety disorders can even increase the risk of depression, substance abuse and physical health issues.

Getting help is like using Google Maps – it’s necessary to navigate through difficult life situations. Don’t wait, seek professional assistance now for a better quality of life.


When will hissing and growling between my kitten and resident feline stop?

Co-existing with two cats can be tricky. The time it takes for them to feel comfortable together can range from a week to a few months. This depends on their ages, personalities, and how they were introduced.

cat, puss, hiss

It’s important to watch them when they’re together. Provide separate litter boxes and feeding stations in different parts of the house until they’re okay with each other. Let them have their own space, but also plan playtime together.

A peaceful relationship between two cats is possible with patience, dedication, and enough resources. However, the timeline varies since each cat’s personality is unique.

Pro Tip: Talk to your vet if either of them show aggression or if there are problems during the introduction.

Frequently Asked Questions

Q: How long does it take for my cat to stop hissing at a new kitten?

A: It varies depending on the individual cats, but it usually takes a few days to a few weeks for cats to accept each other.

Q: What should I do when my cat hisses at the new kitten?

A: Give your cat plenty of attention and reassurance, while keeping the kitten in a separate room for the time being. Gradually introduce the Kitten to your cat in small, supervised increments, and consider using Feliway pheromone sprays to help ease tensions.

Q: Will my cat ever get used to the new kitten?

A: Yes, with time and proper introduction, most cats will eventually accept a new feline companion.

Q: Do male and female cats react differently to new kittens?

A: It’s possible, as individual cats have their own personalities and preferences. However, gender is not necessarily a determining factor in how cats react to new kittens.

Q: Should I let my cat and the new kitten “work it out” on their own?

A: No, it’s important to supervise their interactions and intervene if necessary. Aggressive behavior can be dangerous, and you want to make sure your pets are safe and comfortable with each other.

Q: What if my cat never stops hissing at the new kitten?

A: If the aggressive behavior persists and your cats aren’t getting along, it may be necessary to separate them permanently or consider consulting a veterinarian or animal behaviorist.

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