Hi guys, I have a really frustrating problem that I just can't seem to solve without getting snapped at. My GSD has been very mouthy all his life and I've been dealing with this bad habit by taking him out the room on the leash and ignoring him till he's calm (as recommended on 'Its me or the dog'). It seems to be working lovely and I'm so proud of him. There is a downside though, my dad (I'm 18 years old) is setting back his training by using alpha roles, smacking on the nose, pinning him down and shoving his fist into his mouth. I am livid at the fact he uses these methods and it only makes his mouthing more frequent, harder and now he's beginning to curl back his lip sometimes. My dad and other family members then complain he's not any better, we should have never got him ect. I try to explain positive reinforcement methods work best with him and all I get it insults from 'Don't talk to me like that you little brat, thinking you know everything. I'll do it my way!' How do I explain this to my dad he is infact making my boy worse without being scared to say anything?