I bought Lucky a tug-of-war rope the first day we got him. He didn't touch the thing for the first two weeks and has started lightly gnawing on it in the last week and a half.
Last night, he went to town on the thing. But he didn't really destroy the rope as much as he untied it... like a puzzle.
Lucky untied this rope with his teeth.
I would be much more impressed if he tied it again.