We have three cats right now and will be getting a fourth in another 3-5 wks. I have always had good luck with all my cats getting along. (they curl up together etc.) I'm pretty confident that cat no. four wil fit in fine. We've also talked about getting a fifth cat but I wonder when will the scales tip and they'll start to not get along. So, my question is how many is too many? I love them and could easily see myself having five. Our house is almost 3000 sq. feet so I think it's big enough. I just wonder at what point one starts having problems. Those of you with a lot of cats, how do they get along?