Sent by: Jennifer K. | Portland, OR | Multi-cat household

I need to vent. My cat is a bully, and I don’t know what to do about it.

Her name is Mocha. She’s 4 years old, and she’s beautiful, affectionate with me, and an absolute terror to my other cat, Pepper.

Pepper is 7, super chill, and just wants to nap in peace. But Mocha won’t let her. She stalks Pepper around the apartment. She blocks the hallway so Pepper can’t get to the litter box. She sits by the food bowls and swats at Pepper if she tries to eat. She ambushes her from around corners.

It’s not playful. Pepper is stressed out. She’s started hiding under the bed most of the day. She’s losing weight because she’s too scared to eat when Mocha’s around. I’ve even caught her peeing on the bathroom rug because she couldn’t get to the litter box without walking past Mocha.

I’ve had both cats for years. They used to coexist just fine. But about 6 months ago, Mocha just… decided Pepper was the enemy, I guess?

Here’s what I’ve tried:

Multiple feeding stations. I have three food bowls in different rooms now. Mocha patrols all of them.

Multiple litter boxes. I have four litter boxes spread across the apartment. Mocha still guards at least two of them.

Feliway diffusers. Been using them for a month. Mocha doesn’t care.

Play sessions to tire Mocha out. I play with her twice a day with a feather wand. She loves it. Still bullies Pepper afterward.

Separating them at night. Pepper sleeps in my bedroom now with the door closed. Mocha scratches at the door and yowls.

I’m at my wit’s end. I love both of them, but I can’t keep living like this. Pepper is miserable, and I feel like I’m failing her.

I talked to my vet. She said it sounds like redirected aggression or territorial behavior, possibly triggered by something outside (neighborhood cats, construction noise, etc.). She suggested a behaviorist, but they’re expensive, and I’m not sure I can afford it right now.

I’ve also read about “reintroducing” cats like they’re strangers, but that seems extreme? They’ve lived together for years.

Has anyone dealt with this? How do you stop one cat from being a jerk to another cat? Is this fixable, or do I need to accept that they just can’t live together anymore?

The thought of rehoming either of them breaks my heart. But I also can’t let Pepper live in fear in her own home.

Help.