Introducing a New Cat to Your Cat — A Complete Guide with Printable Log & Tracker

How do you introduce a new cat to the cat you already have? Six stages, clear signals for when to move on, and a log so you can see whether it's working.

Almost every introduction that goes wrong went too fast. The first impression is the one that sticks, and a bad one can take months to undo — which is why this is built around readiness signals rather than a schedule. There is no correct number of days. Some pairs settle in under a week, most take two to four, and some need months.

WHAT'S INSIDE — 22 pages, 16 chapters

Part I — Before They Meet. Why introductions fail, and the three reasons it's nearly always one of. The health checks to clear first. How to set the house up so the cats aren't competing — litter boxes, feeding stations, height, escape routes. And how to build a safe room the new cat can actually settle in.

Part II — The Six Stages. A chapter each for separate, swap scents, eat either side of the door, swap territory, see each other, and share a room — plus going unsupervised. Every stage tells you what to do, what "ready to move on" looks like in both cats, and what to do when it goes badly. Each ends with a Do This Today box, so you always know the next concrete step.

Part III — Reading Them. Body language in three scannable lists: going well, tense, and stop now. A play-versus-fighting comparison for the question everyone asks at stage six. And a chapter on what to do after a bad session, because there will probably be one.

Part IV — Particular Cases. Adding a kitten to an adult cat's home, where the rules genuinely differ — an adult correcting a kitten is teaching, not fighting. And keeping the peace long term, since most multi-cat households that break down do so months after the introduction ended.

Appendix. A printable session log, a stage tracker with dates, and the set-up checklist.

WHY IT'S BUILT THIS WAY

Most introduction guides give you a numbered list and a rough timeline. The timeline is the part that causes the damage, because it invites you to move on when the calendar says so rather than when the cats do. Every stage here has an exit condition instead.

HOW TO PRINT IT

22 pages, US Letter. Read it on a screen or print the whole thing; the appendix pages are designed to be printed on their own and written on.

Not veterinary or behaviour advice. Ask your vet about your cats, particularly if either has a history of aggression.