🐾 AllCatSays
🔎My Cat
Routine

A new cat's first week, day by day: what to expect

Expect hiding and little interest in food at first; let the cat set the pace and come to you.Fact

A new cat commonly retreats to a hiding place, and this is fine. Let them decide when it is safe to explore rather than coaxing them out. In the first days many cats only eat and use the litter tray at night, and really anxious cats may not do even that for the first 24 hours.

Applies to: Newly adopted cats and kittens during roughly the first 1-3 weeks in a new home. Confident cats may skip ahead; nervous or previously stray cats may move slower.

Checklist

Days 1-3: settling and hidingFact
Give the cat a quiet room and stay low-key. Don't try to coax the cat out of hiding; instead spend calm time in the same room (reading, watching TV) and only interact when the cat initiates it. Don't worry if they show little interest in food at first.
  • Let the cat choose hiding and emerging on its own timeline
  • Interact only when the cat approaches you
  • Keep the same food they arrived on to avoid stomach upset
The 3-3-3 pattern (shelter heuristic, not a clinical rule)Estimate
Many shelters describe adjustment as 3 days / 3 weeks / 3 months: disoriented and fearful in the first ~3 days, personality emerging and feeling safe by ~3 weeks, fully settled by ~3 months. This is a rough guideline set by adoption groups, not a medical timeline, and it is explicitly flexible; nervous cats often take longer.
  • ~3 days: may be disoriented, nervous, fearful or overexcited
  • ~3 weeks: gradually reveals personality and starts to feel safe
  • ~3 months: adapts well (longer for naturally nervous cats)
Week 1-3: feeding and expanding the worldFact
Keep the arrival diet for the first 1-2 weeks; only change food gradually over 7-14 days. As the cat grows confident, let it expand into more of the home at its own pace, and keep any new cat indoors for at least two to three weeks.
  • Same food for 1-2 weeks; switch over 7-14 days if needed
  • Widen access as the cat shows it is eager to explore
  • Indoors for at least 2-3 weeks before any outdoor access

Normal vs keep-watching

Normal: Hiding, eating only at night, and being quiet or timid for the first days to weeks are all normal for a new cat. Slow, uneven progress is expected and the 3-3-3 pattern is only a rough guide.

Keep watching: Watch daily for whether the cat is eating, drinking and using the litter tray at all (even overnight), and whether it is gradually spending more time visible and relaxed rather than less.

When to contact a vet. If a newly arrived cat does not eat at all for more than 24 hours (a kitten roughly 12 hours), or you see a sudden change such as ongoing vomiting, diarrhea or lethargy (more than two days), contact a veterinarian promptly. Not eating can become serious in cats, so don't wait it out. This is guidance to seek care, not a diagnosis.

What changes this answer

  • Kittens need more frequent food and tolerate fasting far less than adults, so their not-eating window is shorter
  • A confident, well-socialised cat may settle in days; a previously stray or fearful cat may take weeks
  • In a multi-cat or multi-pet home the settling room and slower introductions matter more

Common mistakes

  • Coaxing, picking up, or forcing interaction with a hiding cat
  • Switching food abruptly on day one
  • Giving the whole house at once instead of one quiet room
  • Treating 3-3-3 as a fixed deadline and worrying when the cat is 'behind'

Sources

Real questions cat owners ask

  • Is it normal for my new cat to hide and not eat on day one?
  • What is the 3-3-3 rule and is it a real medical rule?
  • How long before I let my new cat explore the whole house?
  • When should not eating make me call the vet?
Cat-specific decompression timeline. The 3-3-3 pattern is a shelter heuristic; not eating is more urgent in cats than in many species due to fasting risk. Set up your Cat Passport.

Related decisions