To me neutering is not risky as it is done on the outside of the males body. However it does depend on the rabbit and the vet! My vet specializes in rabbits, she knows whats she's doing and talking about! If my rabbits where at risk she would tell me! The only way I know a neutering can go wrong is if he has liver problems or infection....this can happen with any age. As for spaying I definitly would wait until about 6 to 8 months! We also all know you can't get a male neutered passed the age of 4 years!