Best way to introduce a new cat to my existing cats?

The key is to take it slow and let them adjust to each other's scent before they actually meet face-to-face. When you first bring the new cat home, put them in a separate room with their own litter box, food, and water. This gives your existing cats time to smell the newcomer under the door and get used to the idea without any confrontation. You want to swap their bedding or rub a towel on one cat and leave it near the other so they're building familiarity through scent alone. This phase usually takes anywhere from a few days to a week or two, depending on how curious and chill your current cats seem.

Once they're showing interest rather than hissing or stress behavior, you can try feeding them on opposite sides of a closed door so they associate good things (food) with each other's presence. After that, crack the door open slightly during supervised time or use a baby gate so they can see each other without direct contact. The actual face-to-face meeting should happen in a neutral space where neither cat feels territorial. Keep the first meetings short and redirect any aggressive behavior before it escalates. If there's any real fighting, separate them and go back to the scent-swapping phase for longer.

The timeline really depends on your cats' personalities, but rushing it usually backfires. Some cats click within days, others take weeks. Having extra litter boxes, water bowls, and perches scattered around helps too so they're not competing for resources. Patience pays off here - a slow introduction beats a stressful household where cats are constantly tense around each other.