Introducing your adopted cat to your other cats is all about patience, space management, and being aware of how all your cats are feeling. Here are a few things to keep in mind:
Allow them to look, but not touch
The first stage of an introduction between the cats should be through a closed door. Exchanging blankets or towels between the areas will help the cats get used to each other’s smells.
The next step is to allow them to see each other at a distance from behind a physical barrier such as a baby gate. If the cats are interested in each other and seem comfortable, allow them to meet. Open the door to the rooms between the cats and observe them closely. If any cat shows signs of significant stress or aggression, separate them again and introduce them more slowly.
Go slow and supervise
Interactions should be “short and sweet” (think 2-5 minutes) and always under supervision. Remove one of the cats from visual contact before a reaction occurs.
Make sure you know your current cats
Understanding your current cats’ tolerance for other cats will inform how you introduce them to their new roommate. If your adopted cat is savvy and comfortable with other cats, you may get away with a quicker introduction.
Be patient and reasonable
Progress at the speed of your more reluctant cat. Be very attentive to signs of stress, and be sure to separate both animals at any sign of distress. And remember, don’t expect your cats to love each other immediately. Relationships and tolerance takes time and patience.