New puppy,mastiff/shepherd?

can anyone tell me what the temperment i should expect from this new dog. he growls alot but hasn't bitten yet only got him a day ago..... worried about the future, I got an old small peke and afraid he will be agressive with her when he gets older let me know what ya think. he is 9 weeks old
Update: this is a nine week old puppy who was free from a friend... didn't pay a dime, i didn't breed the parents, german shepherd and bull mastiff... I believe that a person makes a dog aggresive or mild mannered, german shepareds aren't normally supposed to be agressive, they are made that way
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