There are few actual health benefits of neutering a male dog. It is true that testicular cancer is eliminated, but testicular cancer in dogs is uncommon and benign. It is also true that prostatic enlargement and infection are also eliminated by neutering, but these conditions are relatively easily treated medically if they do occur. Behavioral changes with neutering are unpredictable. Prostate cancer is actually INCREASED in neutered males. So, if your male dog is well-behaved, does not live with intact females, and you do not allow him to wander off-leash, there is little justification for neutering.