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This is just my opinion but I would think that the noise of a chain leash jangling while you run would be annoying for him which might cause him to want even more to bite it.
I like the idea of trying to catch him before he grabs it though.
It also sounds like he's testing you, making sure that forbiden things are still forbiden. He's not necessarily trying to become the pack leader though, just seeing where he stands, I think...
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