Hi there,
Is Poppet spayed? She needs to be spayed in order to bond. If not, it could explain why she is so territorial, so that should be the first order of business.
In terms of finding a partner, your best bet is to see if the shelter would let her go on some “speed dates” with potential candidates. Size, age, breed, don’t matter, mostly personality. It would be great if an experienced bonder can observe the first dates with you, as they have a good sense of which pairings will work and which wont.
Keep in mind that even with a good speed date, the bonding process can still be a lot of work, and there is always the chance that the two will not bond, so you’ll need a back up plan in case they don’t (either keeping both rabbits separate, or returning the new one to the rescue). My rescue allowed me to foster Moose while we were trying to bond him with Bertha, and didn’t make me finalize his adoption until he was bonded.
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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.