Just checked out the pen, and that isn’t very much space, which could explain why she has gotten cage-aggressive.
That said, I know you’ve been working to improve your buns conditions and you have made so much progress already. And, the amount of space they get is (sadly) far more than so many buns, who end up in a backyard hutch their whole lives and never even get a pen to stretch out in.
I know you were having issues with your parents and were working on having the buns inside, but I can’t remember what the verdict was.
You mentioned Cocoa hates being picked up, but Lily likes it, so you bring Lily to the kitchen for play time. I wonder if you might be able to train the buns to go into their carrier, then bring them both to the kitchen for some time outside their pen. I am sure it’s great bonding with Lily that way, and I bet it would help your relationship with Cocoa a lot for her to have the same experience (getting special treats and pets sounds like most bun’s favorite acticity).
I’ve recently been able to get my buns to run into their carrier by feeding them their pellets in it. They run right in. I bet yours would too, especially if you don’t pick them up in it the first few times they go in. Basically every meal, I give them their pellets in the carrier. Then once they are used to it, you can bring them to the kitchen and let them hop around together. Since Cocoa is so hard to pick up, this would prob be a good thing to do anyway.
My mom is VERY clean and didn’t like having animals in the house, but even she would let the buns hop around in the kitchen because there wasn’t a danger to the carpet, and they would be supervised so they wouldn’t chew the cabinets or anything.
Most buns don’t like tile, so a few towels or a blanket on the ground would help them be more comfortable exploring.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.