Harness vs Collar: Which Is Better for Your Dog's Neck?

Harness vs collar: it's one of the first questions every new dog owner googles, and the answers online are all over the place. Here's what the research actually says about your dog's neck, which dogs really should skip the collar on walks, and why many owners end up using both.

Harness vs collar: what's the real difference?

A collar sits around the neck. When the leash goes tight, all the force lands on a narrow band of skin over the windpipe, the oesophagus, blood vessels, nerves and the small bones of the neck.

A harness wraps around the chest and shoulders. When the leash goes tight, the force spreads over the breastbone and ribcage, which is a much sturdier area. That's the whole debate in two sentences. The rest is about how much that difference matters, and for which dog.

Picture Max, a cheerful Labrador who spots a cat across the street. With a collar, his 30 kilos hit the leash through his throat. With a harness, they hit it through his chest. Same dog, same cat, very different landing spot.

Is a collar bad for a dog's neck? What the research says

There isn't a mountain of research, but the studies that exist point in the same direction.

Pressure on the neck

In 2020, researchers in the UK tested seven collars and a slip lead on a model of a dog's neck with a pressure sensor underneath. They simulated a firm pull, a strong pull and a jerk. The pressures ranged from 83 to 832 kPa, and the authors concluded that none of the collars kept pressure low enough to rule out injury when a dog pulls on the lead. The model wasn't a real dog, so treat this as a warning sign rather than a final verdict.

Pressure in the eyes

A 2006 study on 26 healthy sled dogs measured eye pressure (intraocular pressure) while the dogs pulled. Pressure rose significantly when they pulled against a collar, but not against a harness. A 2025 study on 24 dogs found the same: exercising in a collar raised eye pressure, exercising in a harness did not. In flat-faced dogs, simply wearing a collar while standing still already raised it.

The lead researcher of the 2006 study added a fair warning: a harness with badly placed straps or buckles can also press where it shouldn't. Design and fit matter.

What vets advise

Veterinarians at Tufts University recommend harnesses for leash walking and keep collars mainly for ID tags. They single out flat-faced (brachycephalic) dogs, whose breathing can be hampered by pressure on the throat, and small dogs, where collar pressure can aggravate a collapsing windpipe. A 2025 review of all the research on walking equipment says flat collars are fine for dogs that rarely pull, but should not be used on brachycephalic dogs.

Does a harness stop pulling? Not on its own

Here's the part most "harness vs collar" articles skip. In a 2021 study with 52 shelter dogs, dogs on a harness clipped at the back pulled harder and for longer to reach a treat than the same dogs on a collar. It makes sense: the chest is less sensitive than the throat, so pulling simply feels less unpleasant. The good news is that the dogs showed no extra signs of stress on the harness.

Where you clip the leash changes everything. In a 2024 study, a harness with the leash on the chest reduced pulling compared with a martingale collar, about as much as prong collars did, without any metal prongs. A front ring works with physics, not force: when your dog leans forward, the leash gently turns him sideways, back towards you.

So the honest answer is: a back-clip harness protects the neck, a front-clip harness protects the neck and helps with pulling. Training still does the real work. For a deeper look at all the styles, read our guide to the different types of dog harnesses.

From our shop

SCOBYDOG No-Pull Harness

Slips over the head in 3 seconds. The front D-ring guides your dog back to your side, with pressure on the chest, not the throat.

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Harness or collar: which is better for your dog?

Puppies

For a puppy, a light harness is a great start: their neck is still developing and they bounce around a lot. Pick one that is easy to put on, so the harness becomes a sign that something fun is about to happen. Puppies grow fast, so check the fit often.

Large dogs

Big dogs pull with big force, and your shoulder feels every bit of it. A harness with a front ring, combined with a leash that absorbs shocks, like a bungee leash, makes those sudden lunges a lot gentler on both of you.

Why many owners use both

A harness for the leash and a collar for identification is a popular combination, and it's what the Tufts vets suggest. A light collar with a tag carrying your phone number is the fastest way for a neighbour to bring Luna home if she ever slips away.

In the Netherlands, dogs must be microchipped and registered within 7 weeks of birth. In Flanders, every dog has to be chipped and registered in DogID by 8 weeks. The chip is the official ID; a tag is simply quicker, because anyone can read it without a scanner.

One more tip: take the collar or harness off when your dog plays rough with other dogs without supervision, or when they're crated at home. Straps can get caught.

What makes a good walking harness?

If you've decided on a harness, look for these points. A harness that's a hassle to put on ends up in a drawer, and a harness that rubs ends up hated.

• Nothing on the throat. The front strap should rest on the breastbone, not press against the windpipe.
• Free shoulders. Your dog should be able to stretch the front legs fully without a strap cutting across.
• Non-tightening. A 2025 review advises a non-tightening front-clip harness as the first choice for dogs that pull. Harnesses that squeeze under the armpits are a last resort.
• Easy on. Many dogs dislike having their paws lifted. A harness that slips over the head and closes with one click takes the drama out of getting ready.
• Padding and visibility. Soft, padded straps prevent rubbing, and reflective stitching helps drivers and cyclists see you on dark evenings.

The SCOBYDOG No-Pull Harness was built around exactly these points: over the head in about 3 seconds, one click, a front D-ring and pressure on the chest instead of the throat. And if it doesn't suit your dog, you have 90 days to return it.

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