I didn't say those parts serve no purpose. I'm just saying they aren't necessary to make a healthy dog in most cases. Dogs do fine with or without them all over the world everyday. So its best if you're going to have them removed to do it while they are a healthy, strong age than to wait and see if they ever get testicular cancer which might not happen until they are old and weaker in health. If and when I get a male dog next I plan to wait for the dog to be done growing to have it done as well, but I'm not going to wait until the dog is old and feeble.