1. Keep Your Cats Separated At First
Even if the cat you are adopting is good with other cats, there is always the possibility of problems when introducing strangers to each other. There are several steps that you can take to reduce the likelihood of problems. Before bringing your new cat home, create a separate “territory” for her. This area should be equipped with food, water, a scratching post, a litter box, access to natural sunlight, and comfortable resting places.
This will provide your new cat with a safe place to get used to thier surroundings and enable you to control how and when your two cats meet each other. After 2-3 days, some cat experts recommend switching the cats’ locations so they can get used to each others’ smells.
Your other cats should have their own separate territory. Make certain that both areas (the space for the new cat and the space for the other cats) contain multiple hiding places so the cats can easily retreat if necessary. Large cardboard boxes with holes cut in two sides make great hiding places. The second hole allows the cat to escape if cornered by another cat. The boxes will come into play once you start allowing the cats to interact directly, but it can be helpful to introduce the boxes first, so that the cats become accustomed to using them. Keep in mind that cats like to hide in high places, so remove fragile items from shelves or block access to the shelves.