How to introduce a new cat to your cat

People often imagine introducing cats like introducing friends: open the door, let them sniff, hope for the best. Cats see it differently. A stranger has arrived in their territory, smelling of somewhere else, and they have no way to know whether it is a threat.

The kindest introductions happen mostly through smell, slowly, before the cats ever see each other properly.

Before the new cat arrives

Prepare a separate room with everything the new cat needs: food, water, litter tray, bed, scratching post and hiding places. This room is their world for the first days, and your resident cat should not be able to get in.

Step 1: separate rooms (days 1–3 or longer)

Let the newcomer settle. Spend time with both cats separately, and keep your resident cat’s routine as normal as possible.

Step 2: swap scents

Rub a soft cloth on each cat’s cheeks and put it near the other cat’s food. Swap bedding. Let each cat explore the other’s room while the other is elsewhere. You are waiting for curiosity or indifference rather than hissing.

Step 3: meals on either side of the door

Feed both cats on opposite sides of the closed door, starting far apart and moving the bowls closer over days. Eating near the other cat’s smell teaches both that the presence of the other means good things.

Step 4: seeing without touching

Swap the door for a tall baby gate or a mesh screen, or open the door a crack with a doorstop. Short sessions at mealtimes or during play. End on a calm note.

Step 5: supervised time together

Let them share a room while you are there, with plenty of high places and escape routes. Keep sessions short at first. A little hissing is normal; chasing, stalking or one cat hiding for hours are signs to go back a step.

Resources: one per cat, plus one

Cats avoid conflict by avoiding each other. Give them the choice: separate food and water stations, and one litter tray per cat plus one extra, in different places. Several scratching posts, beds and perches reduce competition.

How long does it take?

Some cats are relaxed together within a week; others need a month or more. Adult cats rarely become cuddling companions if they didn’t grow up together, and that’s fine. Peaceful co-existence — two cats who can pass in the hallway and nap in the same room — is a success.

Questions owners ask

How long does it take for two cats to get along?

Anywhere from a week to several months. Kittens and relaxed adults adjust faster; older or nervous cats need more time. Going slowly at the start usually saves time overall.

Is hissing normal when introducing cats?

A little hissing is a normal way of saying “not so close”. Repeated hissing, growling, swatting or chasing are signs to go back a step and slow down.

Do pheromone diffusers help?

Synthetic feline pheromone products may help some cats feel calmer, although research results are mixed. They can be a useful addition, but they don’t replace a slow introduction.