I have had trouble with the screaming also. We have a trainer who comes in and he said the dog must be corrected (whatever methods you are using for your corrections) but do it from a distance. Don't go over to him if he is behind a gate-as that is what he wants. Also I was told to not give affection to the dog until you have him come to you and sit. I keep him on leash even in the house as I can practice commands with him throughout the day. Everything must be on your terms so they don't take over. Do you have a mini?