I had a problem with a couple of junior sized black bears last August. Kept knocking over a couple of the hives. ended up losing one. My hives a protected by an electric fence. I bought a 25 miler, puts out 11,000 volts. Couple of weeks ago I heard it snapping one night, went out to see what the problem was and found a tree frog laying across the wire and about a quarter inch from touching the metal post just arcing away.