So sorry for your loss
I agree that it’s hard to know whether it will be quick or not, as it depends on personality. Buns don’t recognize familial relationships, especially once they’ve been apart for a while. But, it does seem that buns that have been bonded before communicate with other bunnies more easily.
Buns who have experienced a loss do sometimes re-bond more easily, but it’s hard to say. Sometimes it seems to take longer, as they are not ready to accept a new companion.
Is the mom from the breeder spayed? If you are looking for a bun to bond more quickly with Jack, you might look into a rescue that has already spayed/neutered buns, and see if you can bring Jack in to meet them and test for compatibility.
Keep a close eye on Jack, as sometimes depressed buns can go into stasis themselves. Even if not ready to rebond, he might find comfort in having another bunny as a neighbor.
I also think you should be sure that your set-up prevents this from happening again before you bring home another bunny. Where the buns so affected by the fireworks because they were outside? if so, you should make plans to bring them inside permanently, or at least on Nov 5 when you know there will be lots of fireworks.
Again, so sorry for your loss. Give Jack some extra snuggles and nose rubs.
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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.