Sorry… Couldn’t help it on the bike forum!
I thought that dogs generally only just reached maturity at 2 years… so it would be hard to tell if leaving his nuts in place was going to cause a problem in the future. Can you just wait and see? There isn’t a time limit for males is there?
I have only had bitches, and have always had them neutered to stop later health issues and because I didn’t either want puppies or have to keep them indoors for their season. I can’t really see any advantage for having males neutered – apart from aesthetics!