Ok so we've a Shetland Sheepdog, roughly 6kg for his max weight, and he has a pretty decent harness (as in you can pick him up from it and it doesn't hurt him, choke him etc) but he only has a decent short lead. It's thick, ropey like climbing rope, and has a massive clasp that can support his weight easily... but it's about 1m long.
His long line is a thin extender lead, like 5mm diameter max, but 5m in length and out in more adventurous areas, walking along cliff edges etc (which we do rather often) it just looks feeble... It's not uncommon for the fenced off paths to collapse underfoot whilst walking in Weymouth for example... We once saw the 'stay left of this sign' sign 6ft below the current path... I'm wondering if it would be possible make him a thicker long line with a decent clasp?
If I were to want to attach a clasp to a climbing rope for example what knot would work? Or would something like a lunge line work, could a lunge line withstand friction against rocks like a climbing rope (to some degree)?