This is not a new behavior for Brody, but one that I have been trying to work on with him since Day One, without much progress. He barks and growls at three of my family members when they come in the door. These are all people who live in the house with us and, with the exception of my daughter who was in England for the first month and a half that we had Brody, they have all lived with us the whole time. I wouldn't mind if he just barked when he heard the door, and backed off when he saw who it was, but he continues in a somewhat threatening way. None of them has ever been mean or threatening to him. My son is very friendly and greets Brody every time, bending down and offering his hand, not approaching him, but waiting for Brody to come to him. My husband, though he doesn't like dogs, tries to sound friendly and always says, "It's just daddy" in a calm voice as he enters, then walks slowly and calmly past him. My daughter tries to be cheerful at first, but when he growls at her, she says something sarcastic to him. I can't blame her, as it is really annoying and he sounds nasty. I have tried giving him warning when I see them coming up the driveway, in a cheery voice "Daddy's home", or whoever it is. Then giving him food as he watches them walk up, hears them open the gate and then the door. I feel like this should have eliminated the issue by now, as he has no reason to fear any of them that I can fathom. Other than him just being taken off guard by someone walking in unexpectedly, there has never been a negative encounter with any of these people. This is causing me a great deal of stress. My stomach is in a knot any time any one of these people leaves the house as I feel like I need to be on watch duty until they come home. I don't want to ever have Brody bite one of them, and I want to help him see them as friends and be happy when they come home. Any suggestions as to what I may be doing wrong here, and what else I could do to change this behavior quickly? I may be getting an ulcer!