I live and hunt in an area similar to yours (and have the occasional Grizzly actually come around my house) so I decided to train a purpose-built dog as a constant trail/hunting companion and early alert or distraction system for Grizzlies. In a former life I spent a tremendous amount of time training LEO working dogs so I'm pretty handy in that respect.
I spent a lot of time searching for the right dog from the right breeder and found exactly what I wanted on a cattle ranch in Northeast Washington. Her parents were working cattle dogs (Catahoula Leopard Dogs) and were also tasked with keeping coyotes and wolves out of the 400 cattle.
There is way too much training detail too discuss here but feel free to PM me I'm always happy to chat on the phone.
The bottom line is you start them early. Have a mental list of everything that you want them to do in the field and tailor frequent training to accomplish that goal.
I have Ruby in the woods every single day of the week. Having just celebrated her fourth birthday , I can honestly state that we move through the woods like a tac team
She is never allowed to proceed ahead of me unless I release her to go through thick overgrown trails. When I stop she stops and when I'm sitting she is not allowed to do anything but sit quietly behind me.
I spent a tremendous amount of time that first spring and summer just having her sit next to me while I ran a foxpro electronic caller just to let her get used to seeing everything from coyotes to black bears come in close.
She learned to sit quietly until I gave her the go signal. Nowadays if she stops and her tail goes up or she puts her nose into the wind I know that it's something of concern. Twice this summer she alerted to thick dog hair cover and barked like crazy. It got my attention and my rifle was ready. Whatever it was disappeared but once again I was very proud of her and we avoided something potentially ugly.
If you work hard at this you will absolutely succeed and reap the rewards for many years.