Berners are very large dogs blessed with very little brain, and to prove it here's Reuby from the Northern contingent of the Dolyhir Clan visiting prior to the 3rd annual Dolyhir Bernese Mountain Dog treasure hunt.
Reuby got herself the wrong side of the fence that goes around the pond. To get there she had to go under the fence, under water. Once there she culd not figure out how she did it and how to get back.
So she sat and waited until her owner turned up with a screwdriver
to dismantle the fence so she could re-join the clan.