there was a massive wild fire two years ago about 100 miles from here, over 100,000 acres burned and all the wildlife moved out of there and into places like where i live, had a mt lion outside my kitchen two years ago, the bears moved in in large numbers and now it's a regular thing too find their paw prints or scat in my front yard. mainly they have become dumpster divers as we have small dumpsters instead of street side garbage can pickup in town.. potato chip bags seem to be a favorite of theirs. My border collie doesn't seem interested in even barking at them, the chihuahua however would love to take one or all of them on with one of his paws tied behind his back. Electric fence.. three strands? two I would think if you are setting it up for large predators might as well set it so it covers the small ones as well like weasels .. bears are smart, i would think if they hit the wire once they won't be back.. not sure about the IQ of a skunk though....I might try too borrow a game camera setup with vid .. just too see what happens when a bear does touch an electric fence...............