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I clip the leash on the front ring under his chin. I don't know why it prevents tugging - but it works. He walks nicely with this harness. When we clip the leash to his collar - he tugs and is out of control!
This is my second harness. Our dog managed to bite thru the first one (used his teeth like a scissors) so it only gets 4 for durability. Interestingly, they offer a warranty against this now - but I make sure I take the harness off when we're not on a walk so I didn't pay extra for the warranty.