I love the goofy stuff dogs do.Sadie won't flee. She's a back you in the corner and won't let you leave type. She's protective, but not vicious. Our Pyrenees couldn't care less.
We had a Great Dane/Boxer mix. He was also about 120 lbs, as well. Funny dude... thought he was a human. He would sit on the couch with me, but whenever the newfie would climb up, he would look at me like, "Hey man. You going to let the dog on the couch?"