I don't know anything about grizzlies or brown bears, but I've been around blacks all of my career. One thing that I do know; don't mess with the mother of any species. Years ago a coworker had recently graduated with a double major... BS in both Forestry and Wildlife. One day he was telling about coming across some bear cubs in a tree, so he climbed it to see if he could catch them. When I mentioned that it might not have been a wise move he replied "adult bears can't climb trees!' Not long after that one of the foresters came back from doing job inspections in the helicopter, and was telling about watching a sow and two cubs in the top of a poplar tree feeding on the buds. As for dogs, noises, and bears; when she was young my last dog used to wear a bell in springtime, to warn nesting mothers that we were around. One day we were walking down a winter road when a bear suddenly tore up out of the ditch about 40 feet in front of us. That bell did no good whatsoever. Toward the end of her life we were walking down a winter road and I noticed a bear feeding on the clover up ahead. Like a dumba** I said "you be good"... until then she was walking quietly by my side but that warned her that something was around so she tore off down the road, running past the bear, then sniffing around before running back to me again. At that point the bear took off into the woods... reappearing on the side of the road 15 feet from me, as my dog stood behind me. I yelled at her and started clacking my tree calipers together; luckily for me the bear turned and ran off, obviously feeling that she had made her point.