If you have a pet rabbit and you want it to be with you for longer than five years (the expected life span of an unspayed bunny) then yes, getting a bunny spayed will prevent cancer. If you remove the uterus of a rabbit, then the chances of getting uterine cancer is eliminated. Obviously you can't spay breeding rabbits, but for people who have them as pets, and want to have them a long time, why just let the bunny get cancer? I don't think God designed rabbits to die, but perhaps He has given people the knowledge that unspayed bunnies can get cancer within a short lifespan for a reason too. You can't deny that bunnies are more prone to cancer after reading up on it. Clearly they are, that is why people with companion rabbits get them spayed or neutered.