The biothane long line, explained
The single piece of gear that changed our walks. Why it's worth the slight cost, and how to use it without it becoming a leash.
For two years we walked with a six-foot leather lead. The dog at the end of it. Always at the end of it. His nose at a clump of grass for two seconds before the lead pulled tight. A walk that was technically a walk and emotionally a tug-of-war.
The fix was a five-metre biothane long line. By the end of this article, you'll know what biothane is, why a long line changes the walk inside a week, and the three rules for using one without turning it into a longer version of the same leash you already had.
Some gear genuinely changes a routine. Most of it doesn't. A treat pouch that fits in a pocket. A poo-bag holder that doesn't squeak. The right collar.
A long line is one of the few that actually changes how the dog walks.
To us, a long line is gear. To him, a long line is more rope and more agency.
This is the kind of small change that produces a softer dog within a week.
The short version
- Biothane is waterproof, easy to clean, doesn't tangle, doesn't soak up beach.
- Five metres is the sweet spot. Long enough for sniff freedom, short enough to manage.
- Let the slack stay slack. The line is a safety net, not a steering wheel.
- A long line is not off-leash. The recall rules still apply.
What biothane actually is
Biothane is a coated webbing material — usually polyester wrapped in a thin layer of TPU. It looks and feels like a slightly soft, slightly rubbery leather strap. It is the right gear for coastal walks for four reasons.
It doesn't soak. Saltwater, mud, beach sand, the unexpected creek. A traditional cotton or rope long line gets heavy and rotten within weeks. Biothane wipes clean with a damp cloth.
It doesn't tangle the way rope does. The flat profile means it lies on the ground without coiling on itself. He runs through it; it doesn't wrap his legs.
It doesn't burn. If he takes off and the line slides through your hand, biothane is dramatically less abrasive than nylon webbing or rope. Wear gloves on the first few outings anyway.
It lasts. A decent biothane long line will outlive two or three regular leads. The cost is roughly the same as one mid-range leather lead.
Why five metres
Three metres is barely longer than a standard leash. He can't make real choices about where to go. The walk feels the same.
Ten metres is too much line to manage. It drags. It catches on bushes. You spend the walk untangling instead of walking.
Five metres is the working sweet spot. He can drift sideways to investigate something interesting. He can choose a slightly longer pause. He can settle into a comfortable stride that doesn't end the moment your foot stops. And you can still pick up the line in two seconds if you need to.
How to use one without turning it into a leash
Let the slack stay slack
The whole point of the long line is that he can move without you. So when he drifts to the side, don't shorten. When he stops, don't reel in. When he walks ahead, let him.
If you find yourself constantly managing the line, you have made it a leash. Drop your hand to your hip. Walk on.
Don't reel him in
Reeling is the move that breaks long lines. He stops at a fence post. You reach down, grab the line, and pull him forward toward you a few inches at a time.
To him, this is identical to a tight leash with extra steps. He learns to expect the pull and starts bracing against it.
Instead: wait. Or walk to him. The line is for safety, not steering.
Long line ≠ off-leash
This is the most common misconception. The long line is not the next step toward off-leash freedom. It is a different tool entirely.
Recall practice on a long line is essential. But a dog who is rock-solid on a long line is not necessarily a dog who is ready off-line. The rules of recall before freedom still apply. The line stays on until the recall is built.
Ask: am I using the line as training, or as a comfort blanket?
Where to find one (Australia)
Most Australian online dog-gear shops carry biothane long lines from $35 to $80. Look for:
- Width of 16 to 19mm (narrower is fine for medium dogs; go wider for large breeds)
- A trigger snap or marine-grade clip on the dog end
- A simple loop handle on the human end (some lines have no handle at all — those are fine for off-line drag, less good for general walking)
- Five metres if you want one length only; six metres if you'd like a touch more for headland work
You don't need the most expensive one. You need one that fits well, doesn't catch on your hand, and dries clean.
It is the small, unglamorous piece of gear that does more for the walk than any harness, treat pouch, or training tool we own. We bought ours after a year of resisting the cost. We wish we had bought it on day one.