Human is traveling down the trail, and comes to a place where a tree has fallen across his path.
“I’ll use my brute strength and opposable thumbs to move this out of the way.” he says.
He labors at this, but the tree is far too heavy to move.
“I’ll use my brain and tools, I’ll use a long pole as a lever, and I’ll move the tree from the trail.”
He finds a good lodgepole pine deadfall, and looks all about to find a fulcrum. He finds a rock about 12 inches high, a few hundred feet from the tree. He carries the rock, returns for the pole, and sets them up beside the tree. He labors at this for a while, but determines he’s not heavy enough, even with the power of the lever, to move the tree.
With no saw, Man turns back to retrieve tools to rid the trail of the tree, returning the next day with a chainsaw and helpers.
Dog is trotting along the trail and comes to the place where the tree has fallen across its path.
Dog walks around the tree, and continues on.
The moral of the story:
Don’t let your over-sized, over-qualified brain do your thinking for you.