My one little girl pup has man fear. I keep Cheerios by the doors so they can throw a treat to her when they enter any room she is in. After a couple of days, she would take the treat from their hands. She still reverts mostly when she is awakened or they walk too fast past me. But for the most part, she tolerates them very well now.
Obviously, 'no' is a trigger for him. Don't use it around him, pick a word he is not reactive to. After he settles in and learns to trust you, you will be able to work at desensitizing to the 'no'.
My other girl was very reactive, thinking I would hit her whenever I moved too fast, like reaching out to grab a toy to play with her, and she bit me quite a few times. She now is showing bite inhibition (where she will put her mouth on me but does not bite hard) and I'm desensitizing her to being hit by play-spanking her, lol, I very lightly smack her butt...more like petting her... she's becoming way less defensive with it. It really takes a lot of time and patience.
Working with a trainer is a great idea... |