New cat inside a carrier meeting a resident cat at home during the first stage of introduction

Introducing a kitten to an adult cat requires the same gradual process as any introduction. What changes is the energy mismatch, the adult's role as social regulator, and how to set up the space correctly.

Introducing two adult cats is the most demanding type of cat introduction, not because it cannot work, but because both cats bring fully formed territorial identities to the situation. Whether they will share a home peacefully depends far more on socialization history and stress tolerance than on sex, age, or breed. This guide covers what is genuinely different about this pairing and how to adjust your approach accordingly.