Gus is neutered, Squirt is not.
I read mostly "positive" reasons for neutering. Here's an opposing view.
Issues Regarding Castration of Male Dogs
The main reason I got Gus neutered was to reduce the likelihood of him running away. This would have been a minor issue, but I can't depend on members of my household to remember to close doors.
He humped his bed, and only his bed before neutering. I took his bed away after surgery, so he wouldn't try to hump it, & open or infect his incision. I gave him back his bed a couple of days ago, over two months after neutering, and he started humping it. Before & after neutering this was the only thing he humped. So, no change.
I found it interesting that before neutering my vet, during an exam, would say something like, "This little boy is in tact", and after it was, "This little boy's been castrated". I don't like the word "castrate".
Gus didn't mark before, and doesn't mark now. No change in before & after behavior.
I think my main issue is the with neutering a male is the prevention of cancer reason. This may be valid, but I'd like to see some statistics.