Human aggression is by far the most dangerous types of aggression. Is she playing or being aggressive? Especially with the pittie breed, you may have a potential law suite on your hands. I HIGHLY suggest seeking a professional behaviorist and obedience trainer, as well as keeping her away from small children and other animals. No dog parks or other populated areas.
What are you doing to correct this behavior?
The two most important commands your dog needs to learn right now are SIT and OFF. When your dog jumps, you need to say NO and with out getting angry and punishing him, simply turn away from the dog and ignore him. By doing this you will let him know that his behavior is not acceptable.
If this will not work, try gently putting up your knee to protect yourself ( not kneeing him, but only raising you knee) while saying no in a firm manner. Do not make a big issue out of it, but just enough to let the dog know that this type of dog jumping is not acceptable behavior. After he is on the ground, praise him and pet him to let him know he has done well by staying on the ground.
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