Keep the new cat in a separate room at first
Provide separate food, water, litter boxes, and bedding
Let both cats get used to each other’s scent by swapping blankets or toys
Feed the cats on opposite sides of the closed door
Allow short visual introductions through a cracked door or baby gate
Watch for calm behavior before increasing contact time
Keep initial meetings brief and supervised
Use treats and praise to reward relaxed behavior
Separate the cats if either shows aggression or extreme fear
Increase interaction gradually over several days or weeks
Maintain multiple litter boxes and resources throughout the home
Give each cat safe spaces to retreat to
Never force interaction
Consult a veterinarian or behaviorist if problems continue