I adopted Pluto as a one year old, intact male. I brought him to my usual vet for his first checkup, shots, the usual things.
After all that was done, the vet asked me "Would Friday morning or Monday afternoon be better for you?"
"For what?"
"Neutering."
"I don't know, what do you think Pluto? Do you want your nuts chopped off so you are more likely to get prostate cancer?"
Pluto, as if on cue, let out a healthy and deep "Vooooooooof", not that he had a clue what I asked.
"There you go Doctor, we'll pass."
Then the vet went on a little bit about male dog spraying, aggressive behavior towards humans and other dogs, and went as far as to say I'd be an irresponsible dog owner if I didn't have it done.
Me, being me, I asked, "Did you neuter your kids? No?" The vet gave me a pissed-off look, paused, and walked away. The orderly who assisted with the visit rang up my bill. She half-whispered "Good for you" while I was writing the check.
Dogs are made a certain way for a certain reason. God, genetic efficiency, evolution, pick one or any it really doesn't matter. Why change a darn good design?
Oh, right, human convenience.