They have spoken with a trainer before, but the man wanted a pile of money and didn't act like he could really do anything much with the dog. The owner had a stroke right around the time he got him, which made things harder. Honestly, I think that they handled the dog wrong when he first started showing signs of aggression. Belle showed some of the same signs at the same age this dog did, but we worked hard with her. I still would never let a stranger in the yard with her, but I never worry about myself, or my family with her. But this pups owner just wasn't in the shape to really work with him. Now he's two, and huge. I really think that he could be changed to a point, but I don't think his owner knows how to go about it.