What do you do when your dad is an abusive drunk?

My dad gets drunk and becomes very angry and abusive. Not really towards us girls (his daughters) but My brother and him do get into fist fights quite often and my dad beats up his girlfriend's SEVERLY. That is why my mother left him after 22 years and that is why his current girlfriend left him. We can't sit him down and have a serious conversation with him and tell him we are worried about him or afraid of him because then he will get angry again and blame it on us or tell us he is going to kill our animals or he will tell us to get out. What should I do with this situation. He is making everyone's life HELL. Thanks.