You are doing a very good thing. Unneutered male dogs run the risk of a bunch of health disorders not seen in neutered male dogs: enlarged prostate (and all the accompanying no-fun effects), testicular torsion, their penis can get stuck outside of the sheath. Unaltered male dogs also tend to drip fluid from the sheath, which is no fun for you or your furniture.

They also tend to do things like mount other dogs and people, mark territory more often than neutered dogs, roam, and have a higher incidence of aggression. I'm sure you were aware of all this, but I know sometimes it helps to see it again.

He won't notice that they're gone, and the surgery is pretty darn non-invasive and safe. He'll be back to his normal bouncy self in a day or two. Good luck to you both!