It’s reasonable for a territorial creature like cats to react when they meet a new kitten. This relationship may go bad if you don’t know how to rapport.

When adding a second cat, you need to learn how to properly introduce the two cats to avoid cats fighting new kitten.

But first, let’s find out why your home cat rejects the new ones and how to do to get them to coexist.

Why your cats become aggressive when the new ones come home?

Types of aggression

There are breeds of cats that enjoy their solitude like bobcats and lynx. For those, welcoming a new member is a foreign definition.

This concept also applies to feral cats, those that grow up on the street. These cats are more into a colonial society, which is led by a female cat. That is why when a new kitten appears; it may confuse the environment and living space.

From there, it can form some sort of aggression towards those they think the invaders.

There are certain types of aggression you can observe to cope with:

Inter-male aggression

Your cats may detect the presence of the new cat as a competitor, threatening their mating zone.

The reaction can including howling, stalking, or puffing up their hair to threaten. Some cats may ignore the situation by walking away while the others show off their upset attitude and back off.

At this point, your interference is needed. Some cat owners will make a distraction by pressing a cue in a firm voice. Others may clap, toss a pillow, or squirt with water to break up the fight.

Social ranking

Kittens display a lower rank in the society of felines. Not only that, they are weak, but they are also not the alpha cat.

As the new cats are foreign in the home, they are likely to get bullied. When the old cats enjoy their unique role in the house, they have the reason to fight.

Defensive aggression

Fear can be a reason for the aggressive reaction. This may come from the past suffering on the street. The cause may include:

  • Punishment from the old owner
  • Rough life from the street
  • Negative incident

This kind of aggression also displays in the form of the cat crouching with a pointed tail, lowering his body, and flattening ears.


Distress is likely to cause the cats not to be friendly. The cause of depression varies. It can be the new home, disease, or even the new household. That makes it challenging to bring a new kitten home and introduce them to each other.

This is possible to observe, or you can consult the vet for a piece of better advice in case you think it is the sickness that is causing the anxiety.

How to stop cats fighting new kitten?

To prevent cats fighting new kitten, there are a few things you need to keep in mind.

Separate food bowls

The dining area of the two (or more) cats should be in different places at first. Cats instinctively consider food is the source of battle. They will react to protect the supply.

Separating food is to avoid the kitten to eat in the other bowl and leave a scent. That upsets the home cat who is already showing his aggression.

Let them sleep away from each other

The resting spot is a personal area that is owned by each cat. It would be best if you did not let the new cat use the bed of the older one freely. This is quite reasonable to understand as you don’t like a stranger to occupy your own bed, right?

Use the different litter box

The litter box is where cats leave their scent. Letting the new cat use the same box my get your old one angry. The cat may ignore using the litter box to defense in his own nature.

Give treats

When introducing the cats with each other, prepare treats, and let them enjoy the snacks together. You can cuddle the new kitten while allowing the older cat to sniff you. That’ll get him to get familiar with the new cat’s scent and accept the presence of the new kitty.

Reinforce this behavior when the cat repeats by giving him treats. That’ll indicate not fussing with the new cat means tasty rewards.

Do it slow

Don’t be hasty because your cat takes time to accept the fact that he is sharing you and his living space with another cat.

In many cases, you may experience random fights. Don’t yell at your cat then. Instead, use your firm voice or distract the battle by throwing a softball.

If possible, supervise when the new and old cats are together. Don’t allow fights to happen in the first place.

In long term, your prevention will form a habit for the old cat.

Things to avoid

  • No expectation: Cats’ behavior is an unexplainable fact. They may do things and do not do things for no reason. So, don’t count on them for working things out.
  • No punishment and yelling: Pushing your cat hard only makes him more anxious. Try to take things easy and slow. In other words, be patient.
  • No added cat: Introducing multiple cats at a time make confuse and upset the older cat worse. If you happen to bring home more than one kitten, allow more time to let the old one get used to it.

In conclusion

It is your responsibility to create harmony among the cats in your house. Getting them to accept one another is a challenging task that requires not only patience but also love.

Remember not to allow the old cats fighting new kitten to happen when you are observing. That may leave them the habit later on.


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