My elderly bun, Rumball, was leaving more poop outside of box but still pretty reliable about peeing. Sometimes there were 4-5 poops where he’d been napping, like he wasnt really conscious of doing them. He was blind and arthritic but still managed jump in and out the box for pee and majority of poops. Some exercise is good for them, when arthritic…
Are you trying any supplements with her?
Personally, I’d go back to the original box if it was only some poop out of box your were dealing with then. Both rabbits could be “protesting” the change also…
If the rug got peed on, they are very likely to keep doing that, I’m afraid.
Hmmm, I wonder if you could make a ramp up into the box that still had high sides?
I put a “half-step” outside the box, using a wide paving brick. They can still get front paws on it getting out and it gave some traction for getting in and out.
That might be worth a try.
With the pooping, has they’re been new pet additions to your home? Or any changes to Mosby she might be reacting too and marking with poop?