A while back we started noticing a stray around our place. We figured eventually she'd go back to her owner, but that never happened. We started feeding her, and since it's started getting cold, we brought her in, got her checked out by the vets and whatnot. At first it seemed the three cats here would get along fine. Now the two are completely terrorising our new cat, Luna. They get her pinned under the bed and wont let her out, and if she manages to sneak and say go into the basement, they stay at the top of the stairs and keep her pinned down there. Not only that, one of our cats, Phoebe, likes to sit on my girlfriend's lap while we watch tv before bedtime. Problem is, Luna likes to do the same thing. It's gotten to the point where we have to keep them separated. This has been going on for about 3 weeks now. My question is, how long should we make an effort to give them a chance to get along together? We've gotten attached to the new cat, but the logistics of feeding separately, multiple litter boxes, giving them the attention they need, is just getting wearisome. It would be so much easier if we could just take care of them as a unit. Again, how long should we try to make this work before we give up and find Luna a new home? Thanks!