Dog Health Questions: My dog plays very rough?

I own a male German Shepherd/Rottweiler mix, who is one and half about. We adopted him July 2nd, 2010, and he is a pretty amazing dog!
We enrolled him in dog training, and he has about two more weeks till he is finished with the basics. (Sit, down, stay, etc.)
But the main problem is that he has Separation Anxiety, so when we arrive home, he jumps up, and is just wanting to play.
In his mind play is to nibble us, and being such a large, strong dog even a nibble hurts! How do we stop this?
Also when he just randomly wants to play, he ignores his toys and once again were his nibble toy.
Please don't say I need to become alpha. I am the leader of him, and he knows it. I can tell because he listens except on that nibble play time of his.
Also I will NOT smack him!

Plus he is my first dog, so I'm not a pro.

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Recommended Answer:
When he starts to jump or nibble on you. Turn around fold your arms and don't pay any attention to him. Only play again ounce he has calmed down.

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• Do not engage. Turn away from him when he starts jumping or nibbling. Every time he goes in front of you, turn around. Don't say anything. Any movement and if you start talking will make him think you are playing with him. When he finally stops give him a treat. Then he will recognize the good behavior as something positive. Good luck.


• I had a rottweiler and I also had a German shepherd, one common trait of both dogs is their energy! so its vital that your dog gets enough exercise, other wise all that energy builds up so much so that your pet cant contain it, additionally your pet may be the most obedient dog ever, but obedience can be hindered when theres bottled up energy just waiting to get out, so what im trying to say is that it will be very hard for your dog to listen if he is incredibly hyper and bursting with energy, additionally you need to make sure that you command him in a strong voice to stop, and perhaps give him a little tug by the nape of his neck that always worked on my dog, its what their mother would do if they ever acted out of line, but all dogs are different, hope this helps