You've gotten great advice. Not unless there is a problem with the reproduction system is my answer. So far, I haven't had a problem with the boys.
As for cancers, testicular cancer is the only one that you can prevent by neutering. If there are no testicles, your dog will not get testicular cancer. Pretty simple. And yet, the other types of cancer: osteosarcoma, hemangiosarcoma, prostate cancer, well they all are more likely if you neuter and the younger it is done the worse it is.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.