Hi! My father adopted an older dog (6 yrs old) from his freind who is now in a rest home. The dog has never been trained in any way, but never abused, always cuddled and loved. He is a mixed breed Benji kind of dog. When he is with my dad, he is VERY aggressive toward anyone who gets close to my dad, even people he knows. He will growl,bite, basically go nuts! When he is away from my father, no problems! I can rub my hand all over his face (when he first brought the dog home, I could not do that! It took a few months) I take him for walks, and he's fine with other people walking by. He goes crazy if someone comes to the front door, barks like a mad dog. My dad does nothing to stop it. In fact, he encourages it! He won't tap the dog on the nose when he's sitting on his lap, growling,trying to bite me if I try showing dad something,etc. He cuddles the dog, which to me encourages bad, aggressive behaviour. My dad gets upset at me for bopping the dog on the nose or using a spray bottle. Oh. The dog goes absolutely NUTS if sprayed in the face. It's very frustrating for me that he won't train this thing. I took training classes so you can see my frustration! Any ideas?