Puppy leads, collars and harnesses: what to buy once and what to buy cheap

Start with the part almost every guide skips, because it is the only part that is not a matter of opinion.

Under Article 2 of the Control of Dogs Order 1992, “every dog while in a highway or in a place of public resort shall wear a collar with the name and address of the owner inscribed on the collar or on a plate or badge attached to it.” Not a phone number — a name and address. Failure to comply carries a fine of up to £5,000, and there is a detail people get wrong constantly: microchipping does not satisfy this. The chip is a separate legal obligation. The tag is still required on top of it.

So the first thing you buy is a flat collar and an engraved tag, and the tag needs your surname and your address on it. A postcode and house number is enough. A phone number is not required but is the thing that will actually get your dog back to you, so put one on. Leave the dog’s name off — a stranger who can call your puppy by name can call him away from you, and that is a real theft pattern rather than a hypothetical one.

That collar exists to carry the tag. It is not what you attach the lead to.

The rule that decides how to spend your money

A puppy outgrows a harness roughly every couple of months through the fastest growth phase, which runs from about three to six months. A labrador can move up two harness sizes inside that window. Most puppies go through two or three harnesses before their first birthday, and the size they finish at has very little to do with the size they start at.

A lead, by contrast, is the same lead at eight weeks and at eight years. There is nothing about a well-made 2m lead that a growing dog changes.

Almost everybody gets this backwards. They spend fifty pounds on a beautiful first harness because it is the thing they can see on the dog, and pick up whatever lead was hanging next to it. Six months later the harness is in a drawer and the lead’s stitching is going.

Spend on the lead. Treat the first harness as a consumable. That is the whole of the advice, and it will save you more than any discount code.

The one exception is worth knowing about, because it is a British speciality. The PerfectFit harness is built in three separate pieces — a girth strap, a front piece and a top piece — which are sold and sized individually. When your puppy outgrows the chest, you replace the chest. Which? recorded full sets at roughly £35 to £54, which is not cheap for a first harness, but it is the one design where buying at the top of the market genuinely stops you buying three times. It is also why it is the harness British trainers and behaviourists keep putting people onto.

Collar or harness for the lead

Attach the lead to the harness, not the collar. This is close to settled among UK trainers and it is not really about comfort — it is about what a lunge does to a neck. A puppy who spots a squirrel and hits the end of a lead attached to a flat collar takes that entire force through his throat. Spread across a harness, it goes through the chest.

That matters more for some puppies than others. Small breeds, brachycephalic breeds and anything with a tendency to a collapsing trachea should be on a harness from the start. But there is no puppy for whom the collar is the better attachment point, so the question is not really worth agonising over.

Front-clip harnesses, which have a lead attachment on the chest as well as the back, are worth understanding. The front clip turns a pulling dog rather than letting him pull you in a straight line, which is why it is sold as “no-pull”. It is a training aid, not a solution — it makes pulling less rewarding while you teach the dog not to pull, and once the lead manners are there you move to the back clip. Several harnesses sold for puppies have both, which is the sensible configuration.

What to actually buy, in order

A flat collar and an engraved tag. Legal requirement, cheap, and the one thing on this list you must not put off. Adjust it so two fingers fit underneath and check it every fortnight, because a puppy’s neck does not stay the same size either.

A harness that fits today. The fitting rule is the same: two fingers between the harness and the dog. It should not slip over the shoulders when he backs up — that is how puppies get loose at kerbsides. Which? found that most of the harnesses it tested come in puppy sizes, and that for young dogs you want lightweight designs without chunky clasps, which is sensible: a heavy buckle on an eight-week-old is a reason for him to hate the whole thing.

One good 2m lead. Not longer for street walking. Two metres gives a puppy room to sniff and gives you the ability to shorten up in one movement when a bike comes past.

A 10m longline, once recall training starts. This is the honest answer to “I want him to have more freedom”, and it is what the retractable lead is pretending to be. A longline is a plain length of webbing. It trails, it gives the puppy fifty times the space of a street lead, and it gives you something to stand on when recall fails. Use it in open space, not on pavements.

Why not a retractable lead

This is the site’s “don’t buy” and it is the least ambiguous one I have written.

The training objection comes first, because it applies even when nothing goes wrong. A retractable lead is under constant tension by design. The dog learns, every single walk, that leaning into the lead produces more lead. You are training the exact behaviour you will later pay somebody to untrain.

Then there is the handling. The housing is bulky and hard to control, and at full extension you have a dog fifteen or twenty feet away on a thin cord, which is precisely when you have the least ability to do anything about what happens next. A UK trainer writing about this describes dogs bolting into traffic before the handler could react.

And the injuries are specific rather than vague. The same account documents a twelve-year-old who lost vision in an eye when a metal clasp snapped back into her face, and a sixty-five-year-old whose fingers were degloved when the cord wrapped around her hand — she described it working like a filleting knife. Thin cord under sudden load does that. It is not misuse; it is the material behaving as thin cord under load behaves.

If what you want is distance, the longline gives you more of it for less money and none of this.

What this costs, honestly

I can give you verified figures at the upper end: Which? tested a field of harnesses this year and recorded the PerfectFit at £35 to £54, the Hounds of Eden Supaw Strong at £38, and the BullyBillows Comfort Premium at £52.99. Those are real prices for harnesses that were actually tested.

At the budget end I am not going to quote you a number I have not checked, because the whole point of this site is not doing that. What I can tell you is the shape of the decision: a first harness for a puppy is available well below those figures from the usual British retailers, and buying at that end is a defensible choice rather than a compromise, precisely because the thing is temporary. Spend the difference on the lead and the tag.

Where this connects

Two of the three items here are sized off the adult dog rather than the puppy — the lead by your handling, the collar by where his neck finishes. That is the same question that decides which crate you buy, and the puppy crate size guide sets out how to arrive at an adult size you can actually trust. If you have a cockapoo, where the answer swings hard on which poodle was used, the cockapoo guide goes into it properly.

And if you are working out the first-year budget as a whole, the food subscription guide covers the line that most people underestimate by the widest margin.

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Prices quoted are from Which?’s 2026 harness testing and were correct when checked in September 2026. The legal position described is the Control of Dogs Order 1992, which applies in England, Wales and Scotland; Northern Ireland has its own rules, so check locally if you are there. This is a guide to equipment, not legal or veterinary advice — for anything to do with your puppy’s health or a specific legal question, speak to your vet or a solicitor.