I have a 2 year old male Papillon that I just inherited. He is still intact. He isn't at all aggressive, and is generally quite polite and restrained with his sexual advances (not a lot of leg-humping, and he stops immediately if asked to). Pretty much his only annoying male activity is licking himself a good deal, but part of that could be due to dry skin troubles.
I know neutering can be helpful for prostate health as well as avoiding testicular cancer. But I am also used to hearing castration recommended for young dogs "before problems develop."
Would there be any drawbacks to neutering him so late in life?