MrNiceGuy, You're kind of looking for an "all in one dog." It's kind of like a guy going into a car dealership and telling the car salesman "I'm looking for a convertable, that has a great payload capacity, can haul over 10,000 lbs, holds lots of children, can do zero to sixty in less than five seconds and is great on gas." It doesn't work that way with cars and it doesn't work that way with dogs. A guard dog is guard dog first and foremost. If you want something that is going to guard the list you gave and some of the suggestions on here is a good place to start. However, also go down to your local dog shelter a few times and talk to the staff. They are nice people and will help you with if not anything else in just looking at the dogs. You'll be able to see these dogs personalities for yourself. You will also be allowed to bring your dog in to see how different breeds may interact with your lab. For the type of hiking that you're doing you don't need a hiking dog. You need an athletic dog that comes from working lines. I would maybe look into a German Shepard.