Poor baby , how stressful
Surprising that they both needed collars when only one ripped out the stitches?
Has she eaten anything? usually with bunnies they will recommend a soft e-collar, because the traditional ones are so hard on them. Has she been given pain meds?
I would recommend taking the collars off when you are there with them, to make sure they can eat and drink, and eat their cecals. Then only resort to putting them on when can’t watch them.
You can give her a bum bath if it’s really bad and dried up already. You can also use cornstarch to absorb the pee and wet stuff and then comb it out. I would try the cornstarch method first and see how you go.
If you give a bum bath, you’ll need to be careful not to get her sutures wet, so it might be better to use a damp cloth to loosen any stuck on poop, then the cornstarch to comb it out. If you need to do a bum bath, the idea is to only get the area that’s really messy wet.
I’ve done this in my bathroom sink. You put a towel in the sink and fill with about an inch of water (should feel like body temp, not hot or cold). Hold the bunny so just their back feet and bum are in the sink, and then use your other hand to clean their bum.
You might also want to put down some puppy pee pads or towels so they don’t end up sitting in pee or poop again.
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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.