I didn't know where to put this, as I don't know if it's actually a training concern or not, but anyhow... My Uncle has a 1 year old male Doberman, Kuma. Dance despises this dog. Always has, ever since the first day he came to our house at 10 weeks old. If he so much as looked at her when he was young, she'd growl and posture at him. When he hit about 6 months old, he greeted her in a way she felt was incredibly rude (and it was), and ever since then it's as if she'd held a grudge against him or something. I have to keep her on a leash now whenever he comes over as she lunges at him. Snarling, growling, hair standing up on end everywhere, tail curled as high over her back as possible, etc. I'm sure the leash creates tension, but I don't know if I should just let them sort it out on their own either. I'm usually all for letting dogs sort themselves out in a lot of cases, but her behaviour is a little too aggressive for my liking. I sometimes put her in her crate when he comes, but I don't like to. She should be able to co-exist with him for the short times he comes to visit and play with Keira. What should I do in this situation? Oh, and she never acts this way toward any other dogs... just Kuma.