Aggressive behavior in young pup

Question
I have a GSD pup that is about 2.5 months old.  He has very aggressive behaviors. You can't even pet him without him biting.  I have had 7 GSD before and never had this type of temperament.  He is beautiful and comes from a registered sire but we can't even enjoy him because he attacks your feet, legs, hands.  If you try to push him off or restrain him, he tries that much harder to bite and fight with you.  He possibly could have been taken from his siblings and mother too early.  We don't know his exact age but are going on what the man we received him from said.  Is there anything we can do to get this aggressive behavior under control?  I love this breed but he is taking all the pleasure out of having a pup.  We have started using the can with rocks to stop his inappropriate behavior.  It gets his attention but if you forget it he can tear you up even at this age before you can get to it.  Please send me any recommendations you have.

Answer
Go to alpha dog boot camp on the web to learn to establish and maintain pack order. This is SO important with any dog but particularly with a very alpha pup such as this one. Meanwhile, get him PLENTY of chew toys, the kind you stuff treats in, the kind with bells ,squeakers whatever will grab his attention. Change them out often to prevent boredom, Set up a ball on a rope for him in the back yard. Preferably a LARGE ball with a rope attached to a tall stake so that it will move when he touches it but the rope is off the ground to avoid getting him tangled in it. Lots of play time. Play fetch with him etc. What protein level is the food you are feeding? As soon as he is old enough get him into puppy socialization and then obedience classes. Alpha puppies are highly intelligent, and make wonderful pets but yes you must get a handle on this behavior now.
When he bites you or attacks you stand VERY still do not kick out with your feet as he is seeing that as more playing and make a very loud CHHH noise as in the beginning of the word chair, Make direct eye contact with your arms folded GET his attention with your words. Do NOT yell at him or hit him. If you can't get his attention lean down and cupping your hand with fingers stiffly outstretched give him a SHARP poke in his collar area, repeating the CHH sound and make direct eye contact. Step toward him if necessary continuing to do this until he backs up and either leaves or sits down.
Do not play tug of war, or play rough and tumble games with him.
Do not allow him to eat until he sits and waits. When you put the food down do not allow him to approach before you give him the OK command. Do not allow him in, or outside until he sits to wait for you to open the door. Try to work with him on learning sit, wait, and ok using treats at least four times a day. Short training times as he will have a short attention span at this age. Maybe fifteen minutes if he can tolerate it. Always praise, reward, good behavior and ignore the bad when training other than biting , see above. End on a positive note and do not progress to the next command until he has learned the first.
You'll be fine and so will he :)
Cindi