Re: Having 2 male dogs
First of all, your pup is still very young and has a lot of learing left to do before you bring another dog into the picture. There is a chance that the pups will bond to each other and not with you.
As far as two males, two males or two females can get along fine in the right environment with an experienced pet owner. For example, if you have a submissive male it would be ok to add a second male that is a more dominant. However, it would be a bad idea to add two male dogs that are both dominant and have the same engery/intensity levels. Your pup is too young to judge this for sure yet.
As far as the two breeds getting along, it is very possible the two breeds will get a long fine. I personally have a pit/gsd mix with my gsd and I have no problems.
I would suggest doing a lot of research about adding a second dog and allow your dog to mature and then when you feel you have to add a second dog I would recommend adding a female.
Diesel - GSD Sable 09/2008
Kohlee - Belgian Groenendael 02/2007
Piper - Pit/GSD mix 08/2006