I've trained quite a few Berners. The majority were quite sensitive and a little shy, nothing like the newfoundlands and leonberger I've trained. I was surprised. They were really great dogs, but you do have to make sure that they get plenty of proper socialization and very fair training, preferably with a strong emphasis on the positive. They should not be yelled at or corrected harshly. I'd compare them in some ways to a sheltie...