Try a plastic rug runner.  Make sure that it continues far enough out to
discourage them from trying at the end of the runner.  If you find that it
works, you may wish to tack it down with carpet tacks (this way, you can
easily remove it later if you wish).
 
Todd and the (Pass the shovel please) Fuzzbutt Rodeo Clowns!
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[Posted in FML issue 2301]