Actually the benefit for male dogs is more so as they reach middle age and can develop prostate problems. So for intact males not used for breeding, it is typically recommended to neuter before about age 6 when the incidence of prostate problems increases. There isn't much true benefit to neutering a male as a pup. Some people claim marking/male behaviors won't happen, but I find that to be more a behavioral issue than anything else. Neutering can help reduce aggression in some cases.
Now this really isn't such a big consideration for our house dogs, but intact males left to roam in certain areas of the country can be at risk for the sexually transmitted disease Brucellosis.
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