K.S.
There is no one perfect cure for things like this but this worked for my kids. If they bite...bit them back....if they pull hair..pull their hair. it completly cured my 2 yr old the first time. That was it. My son didn't "hit" but he liked to throw things at people. Spanking only made it worse...time out..well i guess his energy and anger built up while he was sitting...much worse!!!
One day we were at my brothers and our boys are the same age...My son Dakota threw a book and nearly took Aden's eye out...that was it. We had Aden to pick a toy(we kind of helped him) it was a small toy car but it was made of metal. We had him to throw it at Dakota....I stood around the corner and cried my eyes out but the little car hit him in the back of the head and when he started to cry we explained very calmly that he makes people hurt like that everytime he throws something. That was the last time.
I know that more often than not it hurt mom more than the kid to use tough love but it almost always works. It truly broke my heart to intentionally let someone hurt him but it worked and he never seriously injured anyone.