Hai vydia. Just my thoughts . I own a german sheppard 10 years old and they get along fine and outside they play.Inside my german sheppard choose to stay in the hall and not come in.did that even before Inar with another gsd who was in charge in my house.My german sheppard goes on his back when he knows he loose the fight.Inar fought with him and within 2 seconds he went on his back so issue solved.Inar like i said is very social with dogs so he doesnt terrorise him at all.by the way this was the only fight inar was into and it was in my house and my gsd started because he wnated to show he was in charge.Bad move.But to be anest i think when you have two males in there best years of life not neutered and almost same power you will have a problem and a huge problem one day. Most people keep the males seperated.Can be a small thing that put them on fire and it isnt easy to turn it off when these big guys are mad. I know german sheppard males can also fight very bad at the same age same house but they are less independant and i think it is a bit easier to get them seperated when they are fighting. I wouldnt take the chance.Unless your other boy isnt very dominant and surrender when needed like in my case. Good luck with your search.