The short answer
Most rehomed pets adjust well, and the change is easiest when both owners plan for it. The pattern to expect is the 3-3-3 rule: about three days to decompress, three weeks to learn the routine, and three months to feel at home. The person handing the pet over should send the current food, a familiar blanket or toy, and the vet, desexing, and microchip records. The new owner should keep the routine and food the same at first, set up a quiet safe space, go slow with introductions, and transfer the microchip through the NSW Pet Registry. Give a rehomed pet a couple of days of patience before you worry.
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List your pet free →The first days look worse than they are
If you have just brought a rehomed pet home, or you are the person handing one over, the hardest part to sit with is the start. A dog that will become confident and affectionate can spend its first day flat and withdrawn. A cat that will end up sprawled across your lounge can spend its first night wedged behind the washing machine. That is normal. It is a pet coping with a total change in its world, and it is not a sign the rehoming was a mistake.
Most rehomed dogs and cats settle in well. The animal simply needs time, a predictable routine, and a bit of calm to work out that the new home is safe. Knowing the shape the adjustment usually takes helps everyone stay patient through the slow beginning, which is exactly where good settling-in habits pay off.
The 3-3-3 rule: what to expect
The 3-3-3 rule is a simple way to picture how a rehomed pet adjusts. The numbers are approximate and every animal is different, but the pattern holds for most dogs and cats and it keeps expectations realistic.
The first 3 days: decompression
The pet is overwhelmed. It may hide, sleep a lot, pace, eat very little, or seem shut down. This is not the real animal, it is stress. The job here is to keep things calm and quiet, hold off on visitors and big outings, and let the pet decompress without pressure.
The first 3 weeks: learning the routine
The pet starts to work out how the household runs: when it eats, when it walks, where it sleeps, who lives here. As the routine becomes familiar, more of its normal behaviour appears. This is when gentle training and settling into a rhythm do the most good.
The first 3 months: feeling at home
By around three months most pets feel genuinely settled and their real personality comes through. The confident, affectionate, playful animal the previous owner described is usually the one you have by now. This is the payoff for a patient start.
Helping a rehomed dog settle in
Dogs settle fastest when the new home feels predictable. A few simple habits carry most of the load in the first weeks:
- Keep the routine and food the same at first. Feed the same brand at the same times and keep walks and quiet times predictable. Change things gradually once the dog has settled, and switch foods slowly over a week or so to avoid an upset stomach.
- Set up a defined safe space. A crate, a bed, or a quiet corner the dog can retreat to and not be disturbed. Let the dog choose to rest there rather than forcing it.
- Keep arrival and the first days calm. A quiet, low-key homecoming beats an excited crowd. Hold off on parties, visitors, and long outings.
- Start with short lead walks. Keep the dog on lead in the early weeks, even in a fenced yard, until you know it and it knows you. A newly rehomed dog is at its highest risk of bolting.
- Be patient with toileting. Stress and a new environment can cause accidents even in a house-trained dog. Take it outside often, reward the right spot, and do not punish mistakes.
- Go slow with introductions. Introduce new people and other pets one at a time, once the dog has begun to settle, not on day one.
If you are the previous owner and want reassurance the dog will come good, our guide on whether your dog will be okay after rehoming walks through what actually happens.
Helping a rehomed cat settle in
Cats need even more patience than dogs, and the method is different. The whole approach is to make the new home feel small and safe, then open it up slowly:
- Start in one quiet room. Set up a single room with a litter tray, food, water, a bed, and a couple of hiding spots. One manageable space is far less overwhelming than a whole house.
- Let the cat come out on its own timeline. Do not pull a cat out of its hiding spot. Sit nearby, talk softly, and let curiosity bring it out. Hiding is normal and not a problem.
- Open up the home room by room. Once the cat is confident in its first room, give it access to the rest of the home gradually over several days rather than all at once.
- Keep a new cat indoors at first. Let the cat bond with the new home before it has any chance to roam, so it does not try to find its way back to its old address.
Rehoming a cat rather than a dog? Our free cat rehoming guide covers the listing and handover side.
What to send with the pet (for the owner handing over)
If you are the one rehoming a pet, what you send with it shapes how the first weeks go. A small kit and an honest note make an enormous difference to the animal and to the new owner. Pack:
- The current food. Enough to last a week or two so the new owner can keep the diet the same and switch gradually if they want to.
- A familiar blanket or toy. Something that smells of home. A familiar scent is genuinely calming in a strange new place.
- The paperwork. Vaccination and vet records, desexing history, and microchip details. This lets the new owner keep the pet's care unbroken and know what has already been done.
- A written note about the pet. Its routine, its diet, its quirks, what frightens it, what it loves, and any triggers. The people who know the pet best are the ones who set the next home up to succeed.
Remind the new owner to transfer the microchip registration into their name through the NSW Pet Registry. It is a quick online step, and a newly rehomed pet is at its highest risk of slipping out in the unsettled first weeks, so up-to-date registration matters most right now. Our before-you-rehome checklist covers everything to line up before handover.
When to call a vet
A settling-in vet check in the first week or two is a good idea for any rehomed pet. It is a chance to transfer records, establish care, and ask anything you are unsure about. Beyond that routine check, stress alone can dull a pet's appetite for a day or two, and that is expected.
Ring a vet promptly if the pet will not eat for more than a day or two, refuses water, or shows signs of being unwell such as vomiting, diarrhoea, lethargy, or laboured breathing. Ongoing refusal to eat or drink, or any clear sign of sickness, is a reason to get advice rather than wait it out. If you are unsure, your vet or the Australian Veterinary Association can point you to a nearby clinic.
Rehoming a pet yourself?
List free on LocalPetFinder, keep your pet at home until adopted, and send this settling-in plan with them so the new home starts on the right foot.
List your pet for free →Related guides
What really happens to a dog after it is rehomed, and why most settle in well.
The records, health steps, and prep to line up before the handover day.
List, screen, and hand over owner-to-owner with no fee on LocalPetFinder.
Choose a family who will follow a proper settling-in plan for your pet.
Frequently asked questions
How long does it take for a rehomed dog to settle into a new home?+
A useful rule of thumb is 3-3-3: roughly three days to decompress, three weeks to learn the new routine, and three months to feel truly at home. The exact timing varies with the dog's age, history, and temperament, so treat it as a guide rather than a deadline. The first few days almost always look worse than the eventual outcome, because the dog is overwhelmed and has not yet learned that the new home is safe. Most dogs settle well once they trust the routine.
What is the 3-3-3 rule?+
The 3-3-3 rule describes how most rehomed pets adjust over time. In the first three days the pet is often overwhelmed and may hide, sleep a lot, or eat very little as it decompresses. Over the first three weeks it starts to learn the household routine and shows more of its normal behaviour. By around three months it usually feels settled and its real personality comes through. The numbers are approximate, but the shape holds for most dogs and cats, and it helps new owners stay patient through a slow start.
Why is my newly rehomed dog not eating?+
A dog that skips meals in the first day or two is common and usually down to stress rather than illness. New smells, a new space, and a broken routine all suppress appetite while the dog decompresses. Keeping the same food it ate before helps, as does a calm, quiet feeding spot away from foot traffic. Most dogs are eating normally within a couple of days. If the dog refuses food for more than a day or two, or you see vomiting, diarrhoea, lethargy, or other signs it is unwell, see a vet.
My rehomed cat is hiding and won't come out. Is that normal?+
Yes. Hiding is how a cat copes with a new environment, and it is a normal first response, not a sign of a problem. The best thing you can do is give the cat one quiet room with everything it needs and let it come out on its own timeline. Do not pull it out of its hiding spot. Sit nearby, talk softly, and let curiosity do the work. Most cats begin to explore within days once nothing bad happens. If a cat hides and also refuses food and water for more than a day or two, ring a vet.
What should I send with a pet when I rehome it?+
Send the current food, a familiar blanket or toy that smells of home, and the pet's paperwork: vaccination and vet records, desexing history, and microchip details. Add a written note covering the routine, diet, quirks, fears or triggers, and what the pet loves. Familiar food and a familiar smell make the first days far easier, and the records let the new owner keep the pet's care unbroken. It also helps the new owner transfer the microchip registration into their name through the NSW Pet Registry.
Should I keep a rehomed pet's routine and food the same at first?+
Yes, at least to start. A rehomed pet is coping with a lot of change at once, so keeping the food and daily rhythm the same removes two big variables. Feed the same brand at the same times, keep walks and quiet times predictable, and change things gradually once the pet has settled. If you want to switch foods later, do it slowly over a week or so to avoid an upset stomach. Predictability is what tells a pet the new home is safe.
Should I introduce a rehomed dog to everyone straight away?+
No. Hold off on big introductions, parties, and a stream of visitors in the first days. A rehomed dog is already managing a new home and needs calm, not stimulation. Keep the early days quiet, with short lead walks and plenty of downtime in its safe space. Introduce new people and other pets slowly and one at a time once the dog has started to settle. Rushing introductions is one of the most common reasons a promising first week goes backwards.
How do I settle a rehomed cat into a new home?+
Start the cat in one quiet room with a litter tray, food, water, a bed, and a couple of hiding spots. Keep that room calm and let the cat decide when to come out. Once it is confident in one room, open up the rest of the home gradually over several days rather than all at once. Keep a newly rehomed cat indoors at first so it bonds with the new home before it has any chance to roam. Patience is the whole method with cats.
When should I take a newly rehomed pet to the vet?+
A settling-in vet check within the first week or two is a good idea for any rehomed pet, and it is a chance to transfer records and ask questions. Beyond that routine check, ring a vet promptly if the pet will not eat for more than a day or two, refuses water, or shows signs of illness such as vomiting, diarrhoea, lethargy, or laboured breathing. Stress alone can dull appetite briefly, but ongoing refusal to eat or drink, or any clear sign of sickness, is a reason to get advice rather than wait.
Does updating the microchip help a pet settle in?+
It does not affect how the pet feels, but it is one of the first practical jobs the new owner should do, so it belongs in any settling-in plan. In NSW the new owner transfers the microchip registration into their name through the NSW Pet Registry. It is a simple online step, and it matters because a newly rehomed pet is at its highest risk of bolting or slipping out in the unsettled first weeks. If that happens, up-to-date registration is what gets the pet home to the right owner.
Sources
- RSPCA Australia Knowledgebase: helping a new pet settle and responsible rehoming
- Australian Veterinary Association: new-pet health checks and finding a vet
- NSW Pet Registry: microchipping and transfer of ownership