NEED ADVICE!! 6 YO BULLY

Amber

my son is a bully to other kids. I have tried all I could to let him know this is NOT okay, we do not treat others badly! He has even put his hands around his step brother and sisters neck! Today he got suspended bc a student in class took something he wanted so he tried to cut the students arm with scissors. He thinks he can boss any other kid around. I've tried whooping(as a last resort), taking things from him, timeout, talking . Idk what else to do. Do I speak to his dr about this? I feel like such a bad parent bc my child is acting out like this. He is soooooooo smart and and usually does nothing wrong at school. He is above his grade level in all subjects and loves his new baby sister sooo much! My bf and have been together since he was 2....we rarely get into arguments so it's not a learned behavior from parents fighting.