The specification that actually fits a medium dog
- Length: four to six feet for streets.Six feet gives a 40 lb dog enough slack to walk naturally and sniff without letting it reach the road; four feet is better on a busy pavement. Anything longer belongs in a field, not a street — see what length leash you need.
- Width: medium, around three-quarters of an inch. Wide enough to hold comfortably when the dog lunges, narrow enough that the lead does not weigh on the collar or harness ring. Both extremes of the market get this wrong for this size.
- A traffic handle. The highest-value feature at this size, because a medium dog is exactly big enough that you need instant close control and exactly small enough that you can get it. One grip for walking, one for the moment a cyclist appears.
- Reflective stitching. Free on most leads at this price and the thing that matters if you walk before work or after dark. Our reflective roundup covers the rest of the night-walk kit.
- A bolt snap you can work one-handed. Unremarkable until you are holding a wriggling dog, a bag and a set of keys.
Two leashes, not one
The honest recommendation for a medium dog is that you end up owning two leads, and they do different jobs. The short leadis for streets, kerbs and anywhere you need the dog within arm’s reach — that is the Max and Neo, or the Viper if your walks are wet. The long line is for recall practice, sniffing time and open space: fifteen to thirty feet of webbing that lets the dog range while you keep a physical connection. You cannot substitute either for the other, and trying to is how people end up with a retractable. Our training leash roundup explains how the two are used together, and long line training covers the technique.
A quick note on retractables, since they are marketed hardest at exactly this size. The thin cord gives you no braking control, the lock is the part that fails under load, and the constant tension teaches the dog that pulling extends the leash — the opposite of what you want from a medium dog that is already strong enough to be a problem. The long version is in why retractable leashes are bad, and the replacement setup in non-retractable leashes.
Match the lead to the walk, not the breed
Medium dogs cover an enormous range of behaviour, and the walk matters more than the weight on the scale. If your dog runs with you, go hands-free: the Tuff Mutt puts the leash on a waist belt with a bungee section that absorbs a lunge instead of transmitting it to your spine, and leashes for running covers that case properly. If your dog reacts to other dogs, the traffic handle is not optional and you should read leashes for reactive dogs. If your dog swims, or you walk in rain and mud, biothane is the upgrade worth paying for: it does not absorb water, it does not hold the smell, and it wipes clean — see biothane vs nylon. And if the dog still tows you regardless of which leash is in your hand, the leash is not the problem; how to stop a dog pulling and a front-clip harness are.