On the topic of bears, a very good book titled, 'Bear Attacks - Their Causes and Avoidance', explains the behavior differences between black and brown (grizzly) bears. The book also describes how to best manage an encounter with each type of bear and how to adapt your reaction after assessing the bear's response to your presence.
During August, up to 5 black bears a day stroll by our cabin, usually just scrounging for ripe berries and visiting the creek that is a couple hundred feet from our cabin. None of these bears have been threatening and they ignore our barking dogs, who are within the fenced area around the cabin. The fence keeps predators out - we also have coyotes, wolves, lynx and porcupines in this area.
Even though we live in wilderness and our dogs wouldn't bother anyone because there is no one around, they are both leashed when we're outside the fenced area.