Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

I Just Got a New Kitten & My Older Cat Hates Them: 6 Vet Approved Tips on What to Do

Angry,Calico,Cat,Lying,On,Edge,Of,Bed,Wagging,Tail

Bringing home a new kitten can be stressful not only for your new addition but for your existing pets as well. There is an adjustment period that should be expected with the addition of any new pet to the home, but you’ll need to take steps to make this period go as smoothly as possible. It is not uncommon for older cats to react negatively to the addition of a kitten to the home. It can feel like your older cat hating your kitten is something that will never end, but there are things that you can do to ease the transition.

divider cat paws oct 2024

How to Safely Introduce Your Cats

1. Quarantine Your New Cat and Introduce Their Scents First

The first way you should introduce your older cat to your new kitten is to allow them to smell each other while keeping your new kitten separated, such as in a spare room where they have access to their own food, water, litter box, and bed. You can rub a towel or blanket on your pets and then put the pieces of fabric in the other’s vicinity so that they start to get used to the other’s scent. Next, put them in the other cat’s “territory” to explore without the other cat being there. You can also rotate the cats between the two rooms. Avoid letting them see each other immediately. This should be a slow process that takes at least a few weeks.

young couple reading good news in email on laptop
Image Credit: fizkes, Shutterstock

2. Slowly Increase Access

After the cats seem comfortable with the smell of each other, then you can slowly start increasing their access to each other. First, let them see each other without any contact, and let them interact through the door. Then a face-to-face interaction can be done by putting one in a crate and allowing them to be in the same room under your supervision. Split them up if any aggression starts to show, as this can make the situation stressful for both cats.

Make sure the earliest visual introductions don’t allow the cats to physically access each other. Over time, you’ll be able to allow them to get close to each other with only a screen or gate between them. Increase their exposure to one another until you feel comfortable putting them in the same room as each other, but always with your supervision. Over time, they should get used to each other and will hopefully become good friends.

If there is any aggression, go back a step. Don’t get impatient with this process. Introducing your older cat to your new kitten and helping them learn to like each other can take a while!


3. Monitor for Issues

Once your cats are fully introduced to each other, there may still be tension between the two of them. This is a difficult adjustment for your older cat that requires a lot of patience. Cats hate change, after all. Monitor them closely and try to allow them together only with supervision for several weeks. If your cats are left to their own devices, then aggression and stress may occur without you even realizing it’s happening.


4. Provide Safe Spaces

Your older cat is used to the entire home being their territory, but now they have been put into a situation where they must share the space. Ensure that both of your cats have safe spaces they can go to when they need a break from each other. This may be on a shelf, in a closet or bedroom, or somewhere that only one of the cats can reach. If your older cat isn’t allowed a way to escape from the kitten when they’re overwhelmed or stressed, then they are likely to resort to aggression or withdrawal.

blue-eyed-white-fluffy-himalayan-cat-in-hepper-nest-bed
Image Credit: Hepper.com

5. Keep Their Belongings Separate

Along with having their own safe spaces to retreat to, cats should have their areas to eat, sleep, and toilet. For litter boxes, the rule is to have one per cat, plus one extra.


6. Praise Their Progress

Whenever you notice that your cats are behaving appropriately toward one another, be sure to reward the good behavior with praise and treats. This encourages your cat to continue the good behavior and creates a positive association with the other cat!

divider cats oct 2024

In Conclusion

Slow, controlled introductions are the key to helping your older cat adjust to the presence of the new kitten. Kittens can be little energy bombs that are a lot to take in, especially for an older cat that isn’t used to the energy. Be patient as you allow them to learn about each other.

In some cases, pheromone plug-ins or calming supplements may be needed to help during the adjustment period. If one or both cats seem to be experiencing extreme stress or aggression, then you need to contact a vet for help. Some behavioral issues can be managed with prescription medications, and some may need the assistance of a specialized trainer or behaviorist.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money

Related Reads:


Featured Image Credit: KristiBlokhin, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Does a Dryer Kill Fleas on Cat Bedding? Here’s What Science Says (Vet Answer)

Fleas may be small, but they can cause us and our pets big problems. They are the most common external parasite of cats...

How Often Do I Need to Bathe My Cat? Facts & 7 Vet-Approved Reasons Why

Bathing your cat is not something most owners think about. Cats are notorious for being self-grooming animals. For the most part, they do...

Will Mice Leave If They Smell a Cat? Vet-Reviewed Prevention Tips & Advice

Cats and mice are age-old enemies pitted against each other in the media and in life. Although cats seem to be freeloaders around...

Can Cats Eat Sausage? Vet-Reviewed Nutritional Facts & FAQ

As cat lovers, we all want to spoil and treat our feline friends, but we also want to keep them happy and healthy....

More related

10 Cat Poems Every Pet Parent Should Read: Fun Feline Poetry

When you’re in the mood to celebrate your cat’s greatness with something moving, comedic, or lyrical, you may turn to poetry. There are...

Blood Clots in Cats (Aortic Thromboembolism) – Vet Answer on Causes, Symptoms & Care

Feline Aortic Thromboembolism (abbreviated FATE) is a highly fatal disease caused by a blood clot becoming stuck at the aortic trifurcation—the area where...

Cheerble Wicked Snail Review 2025: Our Expert’s Opinion

Keeping an active kitten or juvenile cat entertained is a full-time job. But who in this day and age has the time to...

Tortoiseshell Persian Cat: Info, Pictures, Origins & History

Tortoiseshell Persians are a unique variety of Persian cats named for their multi-colored coat that resembles a tortoiseshell. Known as “torties,” Tortoiseshell Persians...

Keep reading

How To Get Rid of Fleas on Kittens: 7 Vet Approved Steps

You may be wondering what to do if you’ve recently adopted or are fostering a kitten and have seen telltale signs of fleas, such as biting and scratching. Dealing with fleas requires several steps; the kittens and the environment require...

american shorthair kitten

Why Are Cats’ Noses Wet? Vet-Approved Feline Anatomy Facts & When to Worry

A cat’s nose can occasionally be used as a reasonable indication of their health, but this can be quite variable and should not be fully relied upon. It depends a lot on outside environmental conditions, as well as the cat...

pink cat nose closeup

Can Cats Eat a Puppuccino (Pup Cups) From Starbucks? Vet-Verified Nutritional Info

With many baristas snapping pics of canine customers in the drive-through, treating your dog to a pup cup has taken the influencer world by storm. This free item from Starbucks’ “secret menu” is beloved by dog companions everywhere. Still, we...

Catster_Can Cats Eat a Puppuccino_v1_Jul 16 2024

Is Baby’s Breath Toxic to Cats? Vet-Reviewed Houseplants Examined

Baby’s breath is an extremely common flower in arrangements. The small, white flowers are especially useful at bringing out the colors of other flowers and make a good “background” flower for arrangements. Less commonly, you can also find this flower...

Catster_Is Baby’s Breath Toxic to Cats

Can Adult Cats Eat Kitten Food? Vet-Verified Facts & FAQ

You already know it is important to feed your kitten age-appropriate food, but what if you accidentally feed kitten food to your adult cat? Can adult cats eat kitten food? Yes, you can feed kitten food to your adult cat;...

cat and kitten eating in one plate

Do I Need to Give My Cat Supplements? Vet-Verified Pros, Cons & FAQ

Cats are family members, and we want to ensure they’re happy and healthy and get all the nutrients they need to thrive. Cats require protein-heavy diets, much like their wild cousins. Since they’re obligate carnivores, felines absorb nutrients from animal...

Woman at home holding her lovely Devon Rex cat on lap and gives it a pill

Why Do Cats Have Tails? Vet-Reviewed Science & Facts

Cats move their tails in different positions when showing affection or communicating with humans or other cats. As a cat parent, you may have seen your feline rubbing their tail against your legs when asking for food. Some cats even...

tail of a cat on vintage background

How to Calm Your Hyper Cat: 9 Vet-Approved Tips

Cats have different energy levels, depending on their health, breed, and age. Kittens, for example, are more energetic than most older cats. Some breeds have more energy and agility, bouncing around the house and shredding all your curtains. If your...

blue tabby maine coon cat running outdoors