I had an experience with a broken bond (after 5 months of peace, no obvious trigger), and I opted not to try to rebond them, because I felt that the bond wasn’t particularly strong to begin with (I had also used a marathon technique) and I felt that even if rebonded I would never be able to trust them.
My understanding is that to rebond after a serious fight, you must separate them out of sight and smell for 3 months, to allow them to forget each other, and then start over at square one (short dates in neutral territory). There is no guarantee that you will be able to bond them…. Were they very closely bonded before the fight? Do you know what might have triggered the fight? Any changes to your household?
Personally, given that the bond was very difficult to begin with, and the seriousness of the fight, I wouldn’t try this pairing again. But that’s just me, and I don’t know your buns. There are many that believe all bonds are possible, but it probably isn’t worth the stress and risk to you and your fur babies. Are you able to have them live side by side, but separate, permanently?
I don’t have any experience with trio’s, so someone else will have to chime in on that one.
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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.