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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
Your cat's first day home is a celebration for you, but a massive life event for a territorial animal. According to ASPCA, cats typically need 2–4 weeks to adjust to a new environment, and your approach during the first week sets the foundation for your entire relationship. This guide helps you manage the first 7 days systematically.
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 out of hiding — creates lasting memory that this home is unsafe
- Loud noises or sudden movements — adds weeks to trust-building timeline
- Direct eye staring — aggression signal to cats. Replace with slow blinks
- Sudden food change — stress + new food = near-certain diarrhea
- Immediate introduction to other pets — minimum 2 weeks isolation, then scent-swapping first
First Vet Visit Checklist (Within 7 Days)
- [ ] Basic health exam (weight, temperature, auscultation)
- [ ] Feline panleukopenia antigen test
- [ ] FeLV and FIV tests
- [ ] Parasite check (fecal exam)
- [ ] Vaccination history check and schedule
- [ ] Heartworm prevention prescription
- [ ] Spay/neuter timing consultation (if not done)
Want age-specific care advice? Use the Age Calculator to find your cat's life stage.
※ This article is for informational purposes based on veterinary resources. Always consult a licensed veterinarian for any health concerns.