Keep new cat in separate room

If, on the first meeting, both the cats show aggression, this may set the mood for their future relationship. So, it is best to keep them in separate rooms initially.

Let them feel each other's presence

Make individual provisions for both the cats – food, water, bed, litter box, etc. But feed them both near the door that separates them.

Switch their locations

Cats not only communicate visually but also by scent. So, you must start by introducing them to each other by swapping their scents. To do so, switch their locations.

Let the cats see each other

Put them in an area separated by a transparent barrier where they can see each other. Say their names and toss treats to them.

Let the cats spend time together

The final step is to allow both felines to spend time together, but this time without the barrier. Allow them to spend more and more time together.