I would isolate the other two cats somewhere out of sight for a day or so, and leave a bowl of tuna and a bowl of water in front of the fridge (within sight) for the new arrival. Maybe put on soothing music and wait it out. The cat has to come out at some point...then take the new arrival and...
We have five cats and two dogs.
Copper, 12 yo Golden Retriever, everyone's best friend.
Shadow, 10 yo Black lab, also everyone's best friend.
Here are the five cats in order of who got here first...
1. O'Malley, 5 years with us, 12 YO male Siamese Mix, inherited due to dad's death
2. Maggie...
