Hi there!
So I’m not sure what the timeline was for your past bonding, but I don’t think they were fully bonded. I don’t think the full 6 weeks is really necessary in most cases (I think 3 is a better rule of thumb, and then go off how the buns are behaving), but her hormones could have been at play and triggering his mounting. Or they just needed more time in neutral space to really solidify their relationship. If she was spayed before hormones really set in (which is possible because she was only 4 months old when you got her), then her hormones probably weren’t going completely crazy. Sometimes they stop fighting right away but it can take a bit longer to see grooming and cuddling. I’m sorry you had a hard time with the rescue. 🙁
At any rate, I can see the challenges of having a young bunny and 1 year old who have different diets. I think what you were doing sounds fine, as long as young buns get alfalfa in one way or another they are fine, and lots of people start to transition them to adult diets around 6-8 months (depending on the breed, large breeds need longer).
Now, to your main question! Most pairings of bunnies DO work out. The amount of work required can vary a lot, but it’s rare for a bond to be completely impossible. M-F (neutered and spayed) pairings seem to have the best success rates, but neutered males can also be friends (F-F is also possible but seems harder on average). I also dont think the amount of work required is at all indicative of how close the bond will by. Some of the most difficult bondings I’ve done (like 3-4 months of work), have been the closest once they were finally bonded.
So I think if you are willing to put in the time of getting a bun spayed/neutered, healed, and then the bonding process (whatever that may be), then you have a good chance of success. You should also think about what you will do if it doesn’t work out. Are you willing to have 2 single buns? Since the process of spaying etc. can be pretty long, it’s good to thinking about housing for 2 separate bunnies anyway. You may even decide to do a really long pre-bonding period so that you have less time to worry about feeding two separate diets. 🙂
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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.