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The carrier is on the passenger seat, the cat inside it is yowling like you’re committing a crime, and you’re quietly wondering if you’ve made a terrible mistake. You haven’t. But the next seven days will shape how your new cat feels about your house for years, so they’re worth doing slowly.
Here’s the short version of how to introduce a new cat to your home: give them one small room, leave them alone in it, and let them expand outward on their own schedule. Everything below is the detail.
Before the cat arrives, build one deliberately boring room
Cats don’t move into a whole house at once. They claim a small, predictable territory first and grow it from there. Pick a spare bedroom, a home office, or a bathroom with a door that shuts properly, and set it up before you collect the cat — not after, with the carrier sitting in the hallway.
- A litter box at the far end from the food, because no cat wants to eat next to their toilet
- Two hiding spots they can enter and exit unseen: a cardboard box on its side, a covered bed, or a laundry basket with a towel draped over it
- Food and water bowls, with the water a good body-length away from the food
- A scratching post, or at minimum a stiff piece of corrugated cardboard
- Something that smells like the shelter or breeder, if they’ll let you take a blanket home
Then cat-proof it. Tape down loose cables, move anything breakable off shelves, check that window screens actually latch, and get houseplants out of reach — lilies are genuinely lethal to cats, pollen included, and a cat who nibbles one needs a vet, not a wait-and-see.
A plug-in pheromone diffuser is worth the twenty quid. It doesn’t sedate anyone. It just takes the edge off a room that smells entirely wrong.
The first 48 hours: be boring on purpose
Set the carrier on the floor of the safe room, open the door, and sit down. Most cats bolt for the nearest hiding spot within seconds and stay there for hours. That’s normal. A bold kitten might march out and headbutt your knee within ten minutes. Also normal.
Don’t drag them out. Don’t invite four friends round to meet the new arrival. Sit and read aloud for fifteen or twenty minutes a few times a day, so the cat gets used to your voice and smell without any pressure to perform.
Two things matter more than affection right now: eating and the litter box. If a cat eats, drinks and pees within the first 24 hours, you’re in good shape. Shy cats take longer than bold ones, and that’s mostly temperament rather than breed — though if you haven’t chosen yet, some breeds are famously more forgiving than others. This roundup of the best cat breeds for first-time owners is a good starting point.
Signs the safe room is working
By day three or four you want to see the cat exploring when the house is quiet, eating most of their food, and staying out rather than vanishing when you walk in. Some will start rubbing against your legs. Others will simply sit in the open and watch you, which counts as a win.
Expanding territory, one room at a time
Once eating and litter habits are steady, prop the safe-room door open and let the cat explore the hallway on their own terms. Ten minutes here, half an hour there. Then start closing the door again at night for the first week — a small, known space beats a dark, enormous one when they’re still unsure.
Do this over three or four days, extending the territory a room at a time. Let them find the high spots, the sunny patches and the back of the sofa themselves. Discovery is the point.
Introducing a new cat to a resident cat
Skip this and let them meet face to face, and you’ll get a standoff under the dining table that takes weeks to undo. Do it in stages and it’s often dull, which is exactly what you want.
Start with scent. Swap their bedding every day or two so each cat sleeps on the other’s smell. Then feed them on opposite sides of a closed door, beginning a metre or so back and inching closer over several days, until both eat calmly with a door between them.
Next comes a crack in the door, then a baby gate with a towel over it, then short supervised meetings of five minutes. Expect hissing, a low growl, maybe a swat. That’s negotiation, not war. A week spent on the barrier stage saves you a month of tension later.
If there’s a dog in the house already
Keep the dog on a lead for every early meeting, even if they’ve lived with cats before and are the calmest animal on the street. A barrier, a treat scatter for the dog and plenty of high shelves for the cat will get you through the first fortnight without incident. The full method is here: how to introduce a dog to a cat without turning your living room into a standoff.
Set the house up so the cat doesn’t have to improvise
Cats who scratch the sofa usually do it because nothing better was offered. Put a sturdy post next to where they already scratch, add a second one by their favourite sleeping spot, and reward the good choice with a treat. If it’s already a problem, this guide to stopping a cat from scratching furniture without declawing covers the fix.
Litter boxes follow one rule worth memorising: one per cat, plus one. Two cats means three boxes, in separate places rather than lined up in a row. Placement and the right litter do most of the odour work — I’ve written about why my house stopped smelling like cats even with seven of them, and it wasn’t air fresheners.
Add vertical space. A cat tree, a cleared shelf, a windowsill with a view of the street. Height is confidence for a cat in a new house.
Feeding and play: the two fastest ways to make friends
Hand-feed a few treats or a spoon of wet food each day. It’s a small thing that reliably converts a wary cat into one who associates you with good things.
Then play. A wand toy for ten or fifteen minutes, twice a day, ideally before meals. It mimics the natural hunt-eat-groom-sleep cycle, which is why a tired, fed cat settles far faster than a bored one who’s been pacing the hallway since 2am.
What’s normal in week one, and what isn’t
Hissing at the resident cat, hiding for two days, eating a little less on day one and yowling at night while the house is dark — all standard. Give it time.
Three things need action rather than patience. No food or water for 24 hours. No urine for 24 hours, and especially a male cat straining in the litter box with nothing to show for it, which is an emergency, not a wait-and-see. And any sneezing with green-tinged discharge from the eyes or nose, since stress-related upper respiratory infections are common in cats straight out of a shelter.
Mistakes that cost you a week
Opening the whole house on day one is the big one. So is free-feeding during cat-to-cat introductions, because a cat with a permanently full bowl has no reason to tolerate a housemate near their food. Punishing a hiss teaches a cat to stop warning and start swiping. And washing every blanket the new cat has slept on strips out the scent they’ve just spent days building, so hold off on laundry for a fortnight.
By week four, you’ll notice it’s gone quiet
The cat has claimed a chair, a windowsill and probably your pillow. The two cats eat in the same room with a gap between their bowls. Somebody’s asleep on the router because it’s warm.
That’s the goal: not a dramatic friendship, just a household where nobody’s tense. Keep meals at the same times, keep the litter clean, and keep letting the cat come to you rather than picking them up mid-nap. Cats build trust through repetition, and every predictable day adds a little more. If you’re still in the nervous stage where the cat flinches at footsteps, resist the urge to fix it with attention. Sit on the floor, do something else, and let curiosity do the work — it almost always does, usually on day nine or ten when you’ve given up checking.
