I have a 5 year old step son who my husband and I are both about at our wits end with. He's constantly arguing with us, yelling at us, refusing to listen to us, constantly hurting the dog and laughing about it, and constantly saying "you're not the boss of me. I'm the boss of me" etc. He hasn't been acting like this at school. It seems to be mainly at home.. And definitely directed more toward me I feel. we are starting to look into taking him to a doctor. We are currently documenting All of his behaviors so we can take it to the doctor. Has anyone dealt with a similar situation ? It seems like every act of discipline we try doesn't not phase him.