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Hello. Thanks for the question.
I would definitely get him neutered. Neutering helps to reduce the risk of testosterone induced behavior issues. It eliminates the chance of testicular cancer. It eliminates the chance of developing a perineal hernia. It eliminates the chance of developing peri-anal adenomas (tumors around the anus). It also significantly reduces the risk of prostatic enlargement and prostatic infections.
The anesthetics we use these days are very safe and effective. Most dogs are up trying to run around 12-24 hours after surgery.