For dogs with issues that seem beyond basic manners training, we highly suggest you ask someone who speaks «dog» about it. (opbarks.com)
But as a practical matter, for many dogs with issues like this, it can be very difficult to find a starting point where the dog is truly relaxed and able to learn. (drjensdogblog.com)
He did not live with other dogs but seems to meet other dogs with no issues. (magdrl-nj.com)