Choose a quiet, low-traffic space for the first meeting
Keep the cat carriers separate and use scent swapping before face-to-face contact
Let each cat explore the other’s space briefly, supervised
Exchange bedding, toys, or blankets between cats
Keep initial introductions short and end on a calm note
Use a barrier for first visual contact (baby gate, cracked door, screen)
Keep both cats on leashes or in separate rooms if needed for control
Reward calm behavior with treats and praise
Watch for stress signs: hissing, growling, flattened ears, tail thrashing, hiding, lunging
If stress signs appear, separate immediately and try again later
Gradually increase the time and closeness if both cats remain calm
Provide multiple resources in the shared space: separate food, water, litter boxes
Ensure at least one more litter box than the number of cats
Create vertical escape routes (cat trees, shelves) and hiding spots
Feed cats on opposite sides of a door or barrier to build positive association
Avoid forcing direct interaction; allow cats to approach at their own pace
Supervise all early interactions and separate if tension escalates
Maintain separate sleeping areas initially
Keep play sessions short and rewarding to reduce stress
Use scent-neutralizing cleaning methods between sessions if needed
Continue scent swapping and barrier introductions for several days to weeks as needed
If aggression persists, consult a veterinarian or a certified animal behavior professional