agressive shih tzu puppy

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I have a 11 week od shih tzu puppy that has become agressive any time that he feels restrained in any way. I show him lots of love, praise him every time he does good. He is a great puppy, normal in every other way. How can I get him over this?

Have you taken him to Puppy Kindergarden?
We took our puppy at about 10 weeks old and they showed us how to do a puppy time out, when she starts biting etc we give her a short time out and that stops it.
What does she do when she is being aggresive?

Yeah, define what agressive would be. Also what kind of restraint do you mean? Putting on a lease, inside the crate, holding, etc.

Could someone please explain the "UNDEFINED" business? I see that a lot on posts.