I haven't seen any grizzlies out there. Black bear, but never a grizz. Dogs will usually stay and defend their owners. Usually the dog is enough to spook the bear. I think the dog probably died first.
I worked in forestry in the summers to put myself through university and I had a grizzly stalking one of my crewmembers when we were out on a cutblock. I chased it off with a quad twice, but it kept coming back. It would just walk along the treeline where she was working. Finally, I had to call the foreman on the sat phone and he came out with his rifle. He shot twice, really close to it and then it didn't come back.