There are many points you would like addressed that I’m sure BB members will chime in. I will note on one that stuck out most to me.
You mentioned neutering them, and also called them bonded rabbits. I assume they are both unfixed and 4mo. This is probably what the previous owner told you (that they are bonded). Neutering and spaying rabbits is not only to prevent pregnancy, but it’s also so pet rabbit owners can establish bonded pairs. Young rabbits will get along with nearly all other young rabbits because their hormones are not yet present (i.e. mating and territorial urges). Both rabbits, if they are 4 months old and not neutered, run a very scary risk of having those hormones kick in any time and cause them to fight. In serious cases, rabbits will fight to the death. As of now, they are not bonded rabbits — they are young rabbits who are getting along because puberty has not hit yet. The safest strategy for owners with two, unfixed rabbits, is to separate them until they are both fixed and have time to recover. It sounds very drastic, but there are instances where rabbits cuddle during the day, but one unsupervised night comes along and a rabbit gets overcome by territorial aggression and attacks the other because hormones appear.
The formal bonding process can be quite long. It includes prebonding, dates, supervised playing…. Our website has a section on bonding in the BUNNY INFO tab. I do suggest you check it out to learn some more.
Neutering seems scary, but rabbit care has come a marvelous way. As long as you find an exotic, rabbit-experienced vet, neutering is quite a simple procedure. Many males recover within a couple days, and by neutering your rabbit, you are helping in quelling mating and territorial frustrations which may come naturally without the procedure.
I will add that unfixed, male bonded pairs do exist. They are not common at all to my knowledge, but I’ve read some stories here and there. However, considering the minimal risk of neuters vs the consequences of two hormonal rabbits, I think neutering is the best route.
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.