Key points
- Six feet is the everyday length and the one most places require. Four feet is for crowded pavements and traffic. Fifteen to thirty feet is a long line for fields and recall practice, never for streets.
- The clip fails before the leash does. A bolt snap is the standard; a trigger snap or a locking carabiner is stronger for a big dog. Plastic swivels and thin zinc snaps are where owners report breakages.
- Leather and biothane leads last years and are kind on the hands. Climbing rope leads are strong and comfortable but soak up water. Flat nylon is cheap and burns the hand when it runs.
- Width and thickness should match the dog: half an inch for small dogs, three quarters to an inch for anything that pulls.
Leashes break at the clip. Almost never in the middle, almost always at the small metal piece that joins the lead to the collar, and almost always on a dog that lunged. Owners who have had one fail say the same thing: the leash looked fine, the clip was the cheap part. So this guide starts with the hardware and works back to the length and material, which is the opposite order from most shops.
If you want the quick pick: a six-foot leather or biothane lead, three quarters to an inch wide for a dog over 40 pounds, with a solid brass or stainless bolt snap or a locking carabiner. Add a four-foot lead for town and a long line for fields later.
The clip
A bolt snap is the standard spring-loaded clip with a small sliding bolt you pull back with your thumb. In solid brass or stainless steel it is strong and reliable. In zinc alloy with a plated finish, the common budget version, the spring weakens and the gate can open under a sideways load, which is the failure most often described in reviews.
A trigger snap, or scissor snap, opens with a lever and has a wider gate that is harder to force. It is the usual choice on heavy-duty leads and on anything made for working dogs.
A locking carabiner, screw-gate or twist-lock, cannot open accidentally at all. It is slower to clip on and it is the clip to choose for a big dog that hits the end of the lead at speed. Check that the carabiner is sold as load-rated rather than as a keychain accessory, because they look the same.
Avoid plastic swivels. The swivel keeps the lead from twisting and the plastic ones crack in cold. A steel swivel costs a little more and is the difference between a lead that lasts a season and one that lasts a decade.
Length
Four feet, sometimes called a traffic lead, keeps the dog at your side. It suits busy pavements, crossings, vets’ waiting rooms and anywhere there is no room for a dog to wander. Some people buy a six-foot lead with a second handle near the clip for the same purpose.
Six feet is the everyday length. It lets a dog sniff a tree while you stand on the path, loops comfortably in one hand, and is the length written into most local rules. If you own one leash, this is it.
Eight to ten feet gives more room on quiet walks and starts to need managing in the hand.
Fifteen to thirty feet is a long line. It is for fields, beaches and recall practice, dragged or held loosely in open ground. It is dangerous near roads and other dogs because a running dog hits the end of it with real force.
Retractable leads try to be all of these at once. The cord is thin, the brake can fail under load, the handle is awkward to hold if a dog pulls, and the cord cuts skin if it runs through a hand. Owners report more problems with them than with any other lead type.
Material
Leather, in full-grain hide a quarter inch thick, is the traditional lead for a reason. It is strong, it softens with use into something that is kind on the hand, and it lasts the dog’s life if it is kept oiled. It is heavy, it is the most expensive, and it stiffens if it is soaked and left to dry hard.
Biothane, the coated webbing described in our collar material guide, is waterproof, wipes clean, does not smell and does not stiffen. It feels slightly rubbery and it is the best material for a long line because a wet, muddy long line of rope or leather is a misery.
Climbing-style rope, 10 to 12 mm kernmantle rope with a core and a woven sheath, is strong and round, so it does not cut into the hand. It is comfortable to hold and it soaks up water and mud like a sponge. Look for leather or heavy stitched ends where the clip attaches, because that is where rope leads wear through.
Flat nylon webbing is the cheapest and the lightest. It is strong enough, it frays at the edges in time, and it burns the hand badly if a dog pulls it through your grip. It is a fine lead for a small dog and a poor one for a big dog that pulls.
Chain leads solve chewing and nothing else. They are heavy and hard on the hands.
Width and thickness
A half-inch lead suits a dog under 25 pounds. Three quarters of an inch is the common size for medium dogs. One inch is for big dogs and anyone who wants a lead that feels substantial in the hand. Wider is not always better: a wide, stiff lead on a small dog drags the collar down.
Handles and extras
A padded handle, usually neoprene inside a nylon or leather loop, matters more than it sounds on a dog that pulls. A second handle near the clip, the traffic handle, is useful on a six-foot lead. Reflective stitching helps on dark walks. A small D-ring on the handle holds a waste bag holder.
Hands-free leads that clip round the waist suit running and nothing a dog could lunge at, because a strong pull at the hip takes you off your feet.
Who should not buy which
Anyone with a dog over 50 pounds should not buy a lead with a zinc snap and a plastic swivel, whatever the webbing is made of. Anyone who walks near roads should not use a retractable or a long line there. Anyone who hates maintenance should skip leather and buy biothane. Anyone with a small dog can ignore most of this and buy the lead they like the look of.
How we choose leashes
When we recommend leads in our leashes and harnesses section, each pick lists the length, width, material, the clip type and metal, the handle construction, and what owners of strong dogs report after a year about fraying, stiffening and clips. We make no claims about training or health. Our full process is on the how we choose page.
Final verdict
Buy the clip first: brass or stainless bolt snap, trigger snap or a load-rated locking carabiner, on a steel swivel. Then six feet of leather or biothane, three quarters to an inch wide for a bigger dog. A four-foot lead for town and a biothane long line for the fields are the two additions worth making later.
Questions people ask
What length leash is best for walking?
Six feet for almost everyone. It gives the dog room to sniff at the kerb while keeping it within reach, and it is the length most leash laws specify. Go to four feet in crowds or beside roads, and use a long line only in open space.
Are retractable leashes a good idea?
They are the leash owners most often report problems with: thin cord, a locking mechanism that fails under load, and a bulky handle that is dropped. If you want distance, a fixed long line in open ground does the same job with none of those parts.
What is the strongest leash clip?
A locking carabiner or a trigger snap in stainless steel or solid brass. Bolt snaps are fine in brass or stainless for most dogs. The weak ones are thin zinc-alloy snaps with a plastic swivel, which are standard on budget leads.