Dominant male dogs are generally take-charge types and they will try to dominate any other male dogs that cross their path. Overtly dominant male dogs have even sometimes been known to dominate their masters, because the person wasn't assertive enough to take the alpha role in their own dog's life. It is important to deter male dominance when dogs are puppies, so that issues will less likely arise in adulthood, when dominance can turn into a very serious and dangerous fight. Training, obedience and even neutering can help deter male dominance issues in dogs.
Instructions
Training a dog and making sure they are obedient is a way to prevent male dominance issues. Generally, when two male dogs meet, the dominant one will assert himself to the passive one. But in a case where both male dogs take on the dominant role, a fight can ensue. This is why it is important to always keep a dog leashed in public or when meeting new pets/animals. A leash ensures the dog will listen to commands and not fight.
Have the dog neutered as soon as he is old enough for this procedure. According to the Dog Owner's Guide, getting a male dog fixed can help deter aggression. This procedure takes away some of the hormones that make male dogs more aggressive and less competitive around other dogs.
Take the role of pack leader with any dogs. Dogs need someone to lead them. If their human owner is a good leader, the dog will not be the dominant one in the family, so their probably won't be any issues with other male dogs.