Originally Posted by SEVEN_PETS

If you castrate him, it means you don't have to worry about him causing accidental litters, and if you do meet a bitch in season, they are much less likely to be bothered. When Ollie met one, he was interested but he would still recall away, so he was much calmer than if he was entire. The surgery is less invasive for dogs than bitches, and they usually come out of it very well. Ollie was a bit tired and sleepy for the first day or two, but was bouncy and full of energy after a few days. He near enough had to be castrated twice (once to remove the testicles and a second time to remove a lump that had grown on his scrotem) and he was fine through both operations. I wouldn't neuter until he's a year old though because it can affect growth and behaviour (they never grow up into adults mentally) if they are castrated young.