I don’t neuter (castrate is the gender-specific term for males) my male dogs without an explicit medical reason. I do neuter (spay is the gender-specific term for females) my females at 6 years of age. My neutering protocol takes discipline, record keeping, extra work/time in dog management, and requisite housing facilities. I understand that not all dog owners can/will do the same. But, we can all educate ourselves without too much trouble. Contrary to antiquated but commonly held belief, rarely does neutering correct training or behavioral uses. Early neutering does however cause sundry health issues.
Here’s an article:
What I commonly see is a female dog handler having her male dog neutered prematurely because she thinks whatever that male dog is doing is “gross” and castrating him will “fix” it. Please weigh your decision carefully, and consider the long term health of your dog.