Hi, We have a 12 week old pup. (got her at 9 weeks). Maya is a tri-colour. We are very happy with her. She's a bundle of energy and fun. Don't know what else to say right now but hope to get to know some other people and read lots of advice.
Most people incorrectly use the terms dominant and dominance with regard to dogs. Here is a good blog post by Dr. Sophia Yin on the topic.
http://drsophiayin.com/blog/entry/dominance_in_dogs_is_not_a_personality_trait
I was struck by the fact that your Bernese lived to be 20 years old! Wow! I know they have had concerns with cancer in the breed, and very few of them live that long. How wonderful for you that you got to have her for that long.
Terry