Neutering is best for your dog’s physical health. It totally eliminates his risk of testicular cancer and greatly decreases the likelihood of prostate enlargement and malignancy. It virtually eliminates the gooey discharge that is usually found at the end of the penis of intact adult males.
Neutering is also best for your dog’s behavior. Unneutered males often begin to “hump” toys or furniture or even people in the household. They are more territorial and can become excessively aggressive to people and other animals. Their intact male odor encourages other aggressive dogs to attack them. Unneutered males are often difficult to keep at home. They tend to wander because they are constantly looking for females. They can smell that fine perfume of females in heat from miles away—and off they go. On the way, they don’t watch for traffic, may get shot for trespassing, and may not remember the way home. Intact males also feel the need to mark territory by annoyingly urinating on many upright items—plants, walls, doors, etc. They may actually be impossible to “housebreak” because they will not stop marking indoors.
Once your young dog is neutered, he will probably be less fidgety and nervous and more content to catch a nice snooze in the sun. You will want to monitor his weight, being careful to combine exercise and diet to keep him slim and trim. Field dogs will still be avid hunters. House pet types will simply have less of the unwanted behaviors mentioned above. Of course, neutered dogs are incapable of fathering puppies that would add to the overwhelming homeless dog population. (Yes, even if you do find “good homes” for all of the puppies from your male, that simply fills homes to which other unwanted pups could have gone.)
Dogs neutered later in life usually improve considerably in those testosterone-driven behaviors already noted. But some things, especially wandering and biting may have become entrenched habits and may continue to be somewhat problematic.
So, for the health of your male dog and for the good of the community, please neuter him by 6 months of age. He may not thank you on the day of the surgery, but he will lead a happier, healthier, more adjusted life as a well-accepted household member.