- Lay the foundation for introduction by making a safe space for the new cat.
- Let the new cat feel cozy in the room and then let new and old cat smell each other through the door.A
- After a few days, open the door a couple of inches. Let the new cat go at his own speed. Let the other cat into the cozy space.
- Expect hissing. They are setting up hierarchy.
After the door has been fully opened, remove the second cat litter box (used by the new cat) and put it by the existing cats box.
If you have further questions, feel free to contact a professional pet sitter who specializes in pet behavior. They can help answer any cat related or pet sitting questions you may encounter.