My goodness, Pearl and Colby . . . my sympathies. Considering cats live in colonies, I never understand how they decide WHO can be part of the group and who is not allowed.

My Mandy can't stand Tommy, who is twice her size. They will both taunt one another, and being both are black, black fur flies. I insist they live in harmony, even if not best friends. Mandy lives in the spare bedroom. The door is closed at night, so I can rest in peace. During the day it is open. Mandy could come out, chooses not to. Sometimes, Tommy will go in, turn and walk out, other times go in, sit and groom, just to get her started. Other times, she will charge him with he has turned and is walking out.

I hope you can find a way to get your 2 to live in peace. I used a water squirt bottle A LOT at the start of their battles. Since he is almost 3 times her size, I can't let them fight and sort it out themselves.