If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man.
Mark Twain

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A farmer is allowed to plough over a Right of Way across a field, but he must reinstate the path within a reasonable time so that people can use it.  Sometime he will do this by running a tractor along the line of the path and leaving the passage of walkers to clear it and sometimes he will clear the crop himself.  He is not allowed to plough a path round the edge of a field (a headland path).