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New Cat First Week Complete Guide - Day-by-Day Checklist, Health Warning Signs & Supplies List
Day 1–7 behavioral milestone checklist, health warning signs requiring immediate vet care, and categorized essential supplies table for new cat owners.
Mar 12, 2026
You're thrilled. Your cat is terrified. For a territorial animal, moving to a new home is one of the biggest events of their life. ASPCA says it typically takes 2–4 weeks to fully adjust — and how you handle the first week shapes your entire relationship going forward.
New Cat First Week
Pre-Adoption Essential Supplies Checklist
| Category | Must-Have | Recommended Spec |
|---|---|---|
| Litter box | Litter box, litter, scoop | Cats + 1 box. Open-top preferred for initial adjustment |
| Feeding | Food (same as previous home), bowls | Stainless or ceramic bowls. Keep same food for at least 2 weeks |
| Water | Water bowl or fountain | Place away from food. Fountain increases water intake |
| Rest/Hideaway | Cat hideaway, carrier | Using carrier as bed reduces vet visit stress |
| Scratching | Scratchers (vertical and horizontal) | Sisal preferred. Height must equal cat's full stretch length |
| Safety | Window screens, remove toxic plants | Lilies, azaleas, poinsettias are toxic. Block all windows/balconies |
Day 1–7 Behavioral Milestone Checklist
| Period | Normal Behavior | Owner Action | Warning Signs |
|---|---|---|---|
| Day 1 | Staying in carrier or hiding in corner | Isolate in small room, no forcing, stay quiet | Labored breathing, open-mouth breathing |
| Days 2–3 | Cautious room exploration, eating at night | Quiet activity in same room. Check food and water intake | Not eating for 24+ hours |
| Days 4–5 | Appearing during day, observing owner | Slow blink when eye contact. Let cat approach on own terms | Diarrhea or bloody stool for 2+ days |
| Days 5–6 | Showing interest in owner, sniffing | Use treats for positive association. Wait for cat to approach first | Sneezing or eye discharge for 3+ days (possible infection) |
| Day 7 | Freely exploring home, attempting play | First vet visit (wellness exam, vaccine check) | Refusing food/water or lethargy after 1 week |
Symptoms Requiring Immediate Vet Care in Week 1
| Symptom | Urgency | Possible Cause |
|---|---|---|
| Open-mouth breathing, blue gums | Immediate emergency | Respiratory disease, heart failure |
| Refusing food and water for 24+ hours | Within 24 hours | Extreme stress, underlying illness |
| Blood in stool or urine | Within 24 hours | Gastroenteritis, urinary disease |
| Eye discharge, sneezing, runny nose 3+ days | Within 2–3 days | Upper respiratory infection (herpes, calicivirus) |
| Diarrhea 2+ days or vomiting 3+ times/day | Within 2–3 days | Parasites, stress-induced gastroenteritis |
5 Things Never to Do in Week 1
- Forcing them out of hiding — their first memory of you becomes "this place is unsafe"
- Loud noises and sudden movements — adds weeks to the trust-building process
- Staring directly into their eyes — that's an aggression signal. Do slow blinks instead
- Switching food suddenly — stress + new diet = near-certain diarrhea
- Immediately introducing other pets — wait at least 2 weeks, then start with scent swapping
First Vet Visit Checklist (Within 7 Days)
- [ ] Basic wellness exam (weight, temperature, auscultation)
- [ ] Feline panleukopenia antigen test
- [ ] FeLV and FIV tests
- [ ] Parasite check (fecal exam)
- [ ] Vaccination history check and future schedule
- [ ] Heartworm prevention prescription
- [ ] Spay/neuter timing consultation (if not yet done)
Want care tips matched to your cat's age? Use the Age Calculator to find their life stage.
※ This article is for informational purposes only. Always consult a licensed veterinarian for any health concerns.