Keep them separated in the house, feed them on opposite sides of a closed door. Then, after a week or two, have a baby gate/screen in the door while its open and you feed them treats.
Worked for every cat Ive ever introduced.
this post was submitted on 18 Feb 2026
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Good advice. We also swapped the blankets they slept on, to get them used to each other's scent. Our older one hissed a bit but then chilled out. Later we the new one out, but we supervised their interactions for a week or two. They were best buddies after a short while.
We lost the younger one last year, and the older one keeps going to the place where he used to sleep to sniff around. This might be anthropomorphizing but I can't help but feel like she misses him.
Its really important that if a pet dies, you let the other pets see their body. Animals understand death, and letting them see the body helps stop the "searching" behaviour that you see