Mine is my dearest, best, friend and working partner, Tig. We are sisters under the fur, so to speak. I got a call that she'd been turned into the pound and would not be released because she was dangerous.
She was 8 months old. I spent 20 minutes with her. She was not dangerous, but rather a very high-drive working dog who would not focus on, make eye contact with or acknowledge people. I watched her pull fur tags out of her hips so she could chase them in the breeze from the fan. She stood on her hind legs to roll a chair across the room so she could look out the window in comfort.
I took her home and spent a month being with her and gently intruding on her. I set some basic rules and began training her and suddenly one evening she focused on me and could actually see me. Behaviourally she started over like an 8 week old puppy and over the next year reached, pretty much, where she should be at 2 years.
She is the most powerful, forthright, intelligent, eager, intense, non-trivial, dog I've ever known.