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If you are absolutely 100% sure that you have a male, neutering is more optional. Spaying is a must for females though, due to the unfortunate high rate of reproductive cancer in unspayed females as they mature. Neutering can do a lot to curb unwanted behaviors in both males and females like territoriality or aggressiveness, and improve litter habits as well. Since it isn’t nearly as risky health-wise to have an unfixed male, males don’t necessarily need to be neutered if their behaviors are in control.
Because of the possible health issues, it’s really important to make sure first that you do indeed have a male. Sexing a rabbit is quite difficult, and breeders, pet store workers and inexperienced shelter volunteers mess it up all the time…it’s not uncommon at all for someone to show up here on the forums saying that their bunny who they thought was a male turned out to be a female, or vice versa! In fact, the same happened to one of my bunnies. Your best bet is to take your bunny in to a well-bunny checkup at the vet…the vet will verify the sex for you, and it’s always a good idea to establish a relationship with a vet and get a baseline health check to make things easier if health problems ever come up.