
Sorry to disagree Brainless but i use the same rounded leather cord that accolade use and no, its not safe to use for anything other than a show collar/lead, and I most certainly would not sell a collar made out of that to anyone for any other purpose. (Going into more technical depth, the strength in leather is in the grain side, not the flesh side. This leather cord is a flat strap with all the 'corners' shaved off until you have a strap that is circular in cross section - that however leaves you very little of the strong grain and dense corium of the leahter left, meaning it is not anywhere NEAR as strong as even a thinner flat strap).
In any case, the chain will tear and break the ruff on a long coated dog, you'd really need one with a leather strap taking the place of the circle chain, but even these can catch.