A 160 lb young Blackie strolled through my yard one night years ago. I know exactly how much it weighed because Animal Control tranked it when it was found that morning sleeping in a tree at a softball park a quarter mile down the street.
I'd have not known it was around but my old Bear Dog woke up ready for a fight demanding to be let out. The bear was long gone by the time I found a leash and my pistol.
I replaced the partly broken down flimsy privacy fencing that week with double thick panels screwed down with stainless steel screws.