My husband and I have 2 cats. We got Chloe about 4 months ago. One morning as I was leaving, she ran out of the house. My husband and I were frantic. We walked the neighborhood every night for a week calling for her. We put up flyers with her picture and puts ads on Craigslist asking for her return. After a month of being gone we assumed that she was not going to come home and we decided to adopt another cat. This is how we got Jules. Jules came from a shelter. She was completely miserable there. The staff said that some cats don't take to shelter life and Jules was one of those cats. She seemed sweet but was depressed. So, we took her home and almost immediately she perked up. We picked up Jules on a Saturday, that Monday when I got home from work, Chloe showed back up. She ran past me as I was going up the stairs. I have no idea where she was but she was pretty skinny and dirty. So, I brought her inside and immediately Jules bolted. That was about a month and a half ago, since then things have gotten worse. I understand that there is always a dominant cat but I'm afraid Chloe has gone beyond that. Our house is 2 levels. The bottom level is wide open, it has a paved area for our car and the rest is hardwood floor. Jules pretty much lives on this level under the car because Chloe won't let her come upstairs. Chloe does things like eats all her own food and then runs to Jules' food and eats it. If Jules tries to stand up to her Chloe hisses and goes into attack stance. If Jules still doesn't back down then Chloe will attack her. If Jules even attempts to come upstairs, Chloe immediately attacks her. I've tried to stay out of it because I figured they needed to figure out their hierarchy, but it's gotten to the point where I've started to step in. I've tried to treat Chloe as the dominant cat by doing things like feeding her first and giving her alone time first but it doesn't seem to help. We've even tried reintroducing them. As it stands we have had to put a litterbox/food downstairs for Jules because she won't come out from under the car. If the car is not there then Jules hides behind shelving. It's gotten so bad that Jules runs from both me and my husband and won't let either one of us get near her. If I offer Jules a treat she will snatch it out of my hand and run under the car to eat it. There have been a few times when Chloe was out of the house (at the vet) and Jules will come out and play and let you pet her. My husband and I both want to do right by Jules. Is there anything we can do about Chloe's behavior or should we just let Jules go? If we decide to let Jules go there is no way we would put her back into a shelter, she was just too miserable when she was in one, we would attempt to find her a home. This whole situation is making me really sad. Thanks for any advice you can give.