I know. I am going to try really hard to make him behave. He is really very gentle with the grandchildren. My one year old granddaughter doesn't even come up to his chin. He was very careful not to knock her over. She just loved to pat him.
However, New Year's Eve a really dear friend, who is 78 but looks 60 and acts 40, and I went to dinner at a jazz club. When she came in the house, Harm unexpectedly jumped up on her back. She is shorter than I am, so he was a lot taller than she was. It was a blessing that she did not go down on the floor. It scared me to death. He has never done that before. Luckily she is a dog lover, but it scared her, too.
Gotta get that bad doggy trained. He is bossy. He is demanding and I have to do what he wants, or he barks his head off at me and if he can find a piece of my clothing, he races through the house with it until I do what he wants.
The collar is good and grabbing his feet and pushing backwards until he falls is good also.
Another is to raise your knee when he tries to jump up and your knee will hit him in the chest but I think he is too big for that
I agree with Hairofthedog that you need to be the one training him with a private trainer or a class
Northern breeds are more stubborn and because he is 4 and has gotten away with a lot with his mommy, he will resist but keep up the classes (8 or more weeks) and you will see results