He does not know his testicles are gone, in all likelihood. It's not like humans, male dogs don't feel any less whole after neutering and female dogs don't miss not having babies.
If it is bothering you aesthetically, than by all means do as you please. But it is a 100% unnecessary procedure- he doesn't miss them. Does it require anesthesia? If so, weigh the risks of putting a small chi under anesthesia with the relatively small benefit of the procedure (aesthetic benefit for you). Besides that, what other benefits do you see?
There may be some people that have elected for the procedure but I don't know if anyone on here has. Hopefully if they have they will chime in.
Sent from my iPhone using Petguide.com App