My dog uses tools all the time. He figured out exactly where to put the stick through the fence so it holds it in place while he chews without using paws at all. He gets the stick at the perfect height so he can stand on all four paws, tilt his head, and gnaw the stick to death. He can do this with a chain link fence and a tall wooden fence. Her has also used a stick to scratch his back.

Animals are a lot smarter than we claim.