This is a bit long, but I need to get it out somewhere, and maybe give hope to anyone going through cat introductions from hell.

I’ve been living with my sister for the past 1.5 years, and we each have a cat that absolutely hate each other. We’ve been trying to get them to coexist for years.

Her cat, Nala, is 13 now. We adopted her when she was 3, and even back then, when she was the only cat in the apartment, she took six months to feel comfortable walking around. She’s always been very anxious and territorial, and fun fact: she only sits on laps or pillows with her paws on the couch, like she refuses to fully commit (cat tax is paid, there’s a picture).

After she finally settled in, I adopted Leia as a kitten. And yeah, that did not go well…

Nala attacked her immediately. Leia was tiny and terrified, and we had to separate them right away. We tried doing everything properly: separate rooms, scent swapping, slow introductions while feeding and playing with them at the same time… but we barely made it past the first stage.

Leia grew up to be super sweet, hates sleeping alone, and loves sunsets, but she’s also kind of… intense. She doesn’t really understand boundaries, play-bites too hard, and other cats read her energy as aggression, so every interaction between the two turned into a real fight.

At one point, we even had a big cage in the living room with blankets around it, so they could technically be in the same space without seeing each other. It felt like we were running a luxury cat prison.

After almost a year of trying (the first picture is from that first introduction trial, the first 30 seconds they stayed that close without fighting), I had to move out and took Leia with me.

Fast forward 7 years, and I end up moving back in with my sister, so the cats are reunited and… nothing has changed. They still hate each other just as much. If anything, they’re worse. Leia had turned into a screaming demon anytime she saw another animal, and Nala had gotten into fights with neighborhood cats.

So we decided to start over, but this time really commit to the process. We watched videos, followed a structured approach, even hired a professional.

We did the full separation again, and it took a full year (!!) before we felt ready to move forward. The only reason we even progressed was that both of them started protesting so much that it felt like they were ready. Leia would scream nonstop and learned how to open doors, and Nala would dig at doors and complain too.

We had to get creative for phase 2. Leia stays on a leash in the living room (with all her stuff there: food, water, litter box, bed, balcony access so she can still enjoy the sunset). Nala has the rest of the house. We also put up a blanket barrier so they wouldn’t have constant eye contact. The screaming stopped, everyone calmed down, and for the first time, it felt manageable.

After about six months of this, Nala started shifting. First, she would ignore Leia completely, but started approaching her. Not in a friendly way, though. Lots of hissing and very territorial. Leia would get confused, sometimes scared, sometimes curious, but she wasn’t immediately escalating anymore.

We stopped intervening so much and just supervised closely. Leia is clicker-trained, so I can usually stop her with a sound, and the leash gives me enough control that things don’t escalate.

Also, we don’t worry too much because Nala is kind of a coward lol she’ll act all brave, hiss, try to slap from afar… and then run away the second Leia turns around. It’s so cute, it’s hard not to laugh.

And finally, this weekend I had a pleasant surprise: Leia was lying on the couch, on her leash. Nala wanted to cross the living room to get to the balcony. I could see her gathering courage before making a run for it. She went for it, and Leia immediately got up, but I held the leash and calmed her down, and she relaxed.

Nala stayed on the balcony for a bit, then came back. She seemed too afraid to run in front of Leia and decided to jump on the couch. Leia, on the opposite side of the same couch, noticed her and wanted to go closer, but when I told her no, she just… stopped. No pulling, no drama.

I put a pillow down, Leia sat on it, and now I’m sitting here typing this with one cat on each side of me. Both completely relaxed.

After years of trying, failing, separating, restarting, and doing this weird leash setup… they’re finally okay being near each other. I honestly didn’t know if we’d ever get here.

Anyway, I just wanted to share. If you’re dealing with cats that hate each other, it can feel impossible, but apparently, it just takes a ridiculous amount of time.