Keep the new cat in a separate room at first
Provide separate food, water, litter box, and bedding
Let the cat settle in for a few days
Exchange scents using blankets or toys
Feed both cats on opposite sides of a closed door
Allow brief visual contact through a barrier
Watch for signs of stress or aggression
Increase interaction time gradually
Supervise all face-to-face meetings
Give both cats escape routes and hiding spots
Reward calm behavior with treats
Do not force interactions
Maintain routine and consistency
Separate them again if tension rises
Be patient and move at the cats’ pace