Choosing the right harness for your dog can feel surprisingly complicated. Walk into any pet shop and you’ll find back clips, front clips, step-ins, vests — and enough adjustable straps to rival a climbing harness. Get it right, though, and you’ll have a walking tool that’s comfortable, secure, and genuinely helpful whether you’re trying to manage a boisterous Labrador or simply looking for a snug fit for your Chihuahua.
In this guide, we cover everything you need to know: the different types of dog harness, how to measure your dog correctly, what features to prioritise, and when a harness makes more sense than a collar. By the end, you’ll know exactly what to look for — and what to avoid.
Types of Dog Harness Explained
Not all harnesses are built the same, and the type you choose will depend heavily on your dog’s behaviour on lead. Here’s a breakdown of the main styles available in the UK.
| Type | How It Works | Best For | Examples |
| Back Clip | Lead attaches to a D-ring between the shoulder blades. Dog pulls forward in a straight line. | Calm dogs, casual walks, puppies learning the ropes | Julius K9 IDC, Ruffwear Front Range |
| Front Clip | Lead attaches at the chest. Pulling redirects the dog back towards you. | Pullers, dogs in training, reactive dogs on lead | PetSafe Easy Walk, Halti No-Pull |
| Dual Clip | Both front and back D-rings for flexibility depending on the situation. | Most dogs — versatile and adaptable | Ruffwear Front Range, Hurtta Weekend Warrior |
| Step-In | Dog steps into two loops; clips on the back. No need to put over the head. | Head-shy dogs or dogs that dislike overhead dressing | Puppia Soft, Ancol Step-In |
| Vest / Padded | Wrap-around padded design distributes pressure across a wide area. | Small breeds, dogs with neck/trachea issues | Voyager, Gooby Escape Free |
Back Clip Harnesses
Back clip harnesses are the most common style and a good default choice for dogs that already walk calmly on lead. The lead attaches to a D-ring between the shoulder blades, allowing your dog to move freely without any restriction to their gait. Because pulling goes in a straight line, they’re not ideal for dogs that lunge — but for a relaxed weekend walk, they’re comfortable and easy to use.
Front Clip Harnesses
The front clip is positioned on the chest plate, and it’s the go-to choice for dogs that pull on lead. When your dog surges forward, the lead attachment causes them to turn back towards you — which naturally interrupts the pulling behaviour without causing any pain or discomfort. Most dogs reduce their pulling noticeably within a few walks. It’s not a magic cure, but used alongside training, it makes a real difference.
Dual Clip (Multi-Clip) Harnesses
If you can only buy one harness, make it a dual clip. These have D-rings on both the chest and back, so you can switch between training mode (front clip) and casual walk mode (back clip) depending on the situation. Brands like Ruffwear and Julius K9 make well-regarded dual clip options that hold up well over time.
Step-In Harnesses
Step-in harnesses are particularly useful for dogs that dislike having something pulled over their head. Your dog steps into two loops and the harness clips on their back. They’re popular with smaller breeds and are generally lightweight and simple. The trade-off is that they can be easier to slip out of, so they’re best suited to calmer dogs and not recommended as a sole option for escape artists.
Vest and Padded Harnesses
Vest-style harnesses wrap around the body with a wide padded panel, which is excellent for distributing pressure evenly. They’re particularly popular for small breeds, puppies, and dogs with tracheal issues or neck sensitivities. They tend to be a bit warmer, so if your dog runs hot, look for a mesh or ventilated version.
How to Measure Your Dog for a Harness
Getting the measurements right is the single most important step when buying a harness. A poor fit will either restrict your dog’s movement or allow them to wriggle free — neither is ideal. You need two measurements: chest girth and neck circumference.
Chest Girth (Most Important)
Wrap a soft tape measure around the widest part of your dog’s chest — this is typically just behind their front legs. Keep the tape snug but not tight; you should be able to slide two fingers underneath comfortably. This measurement is the primary sizing guide for most harnesses.
Neck Circumference
Measure just below where your dog normally wears a collar. This helps ensure the harness doesn’t sit awkwardly on the neck or rub behind the ears.
When in doubt, always size up — harness straps can be tightened, but they can’t be lengthened. If your dog is between sizes according to a brand’s size chart, go with the larger option and adjust the fit from there.
Dog Harness Size Guide
The table below provides general sizing guidance. Always check the specific brand’s size chart before purchasing, as sizing can vary quite a bit between manufacturers.
| Size | Chest Girth | Typical Weight | Example Breeds |
| XS | 26–50 cm | Under 5 kg | Chihuahua, Pomeranian, Yorkshire Terrier, Toy Poodle |
| S | 35–66 cm | 5–10 kg | Cavapoo, Jack Russell, Shih Tzu, Miniature Schnauzer, Westie |
| M | 40–71 cm | 10–20 kg | Cocker Spaniel, Cockapoo, French Bulldog, Corgi, Pug |
| L | 55–83 cm | 20–35 kg | Labrador, Golden Retriever, German Shepherd, Husky, Dalmatian |
| XL | 71–99 cm | 35 kg+ | Rottweiler, Boxer, Great Dane, St Bernard, Mastiff |
Note that chest girth is almost always the most reliable measurement. Weight alone can be misleading — a lean Greyhound and a stocky Bulldog can weigh the same but need very different fits.
Key Features to Look For
Once you’ve determined the right size and type, here’s what separates a good harness from a great one.
Adjustability
Look for a minimum of four adjustment points — two across the chest and two around the body. This allows you to achieve a genuinely custom fit, which matters more than it might seem. A well-adjusted harness won’t rub, won’t shift during walks, and is much harder for a dog to back out of.
Padding
A padded chest plate is important, especially for dogs that pull or wear their harness for extended periods. Without padding, the constant pressure from a lead can cause rubbing and skin irritation. Neoprene lining is one of the more comfortable options; mesh padding works well for dogs that overheat.
Hardware Quality
Metal D-rings and buckles are significantly more durable than plastic. For large or powerful dogs in particular, plastic hardware can fail under stress. Aluminium or stainless steel hardware is worth the extra cost for anything over around 15kg. Side-release buckles should click shut firmly and not pop open accidentally.
Reflective Elements
Reflective stitching or piping is genuinely useful for early morning and late evening walks, particularly in winter when UK days are short. Most decent mid-range harnesses include some level of reflectivity. If your dog walks in low light regularly, treat this as a must-have rather than a nice-to-have.
Handle on the Back
A grab handle on the back of the harness is extremely useful for steadying your dog in traffic, lifting them over obstacles, or keeping them close in a tricky situation. Not all harnesses include one, but it’s a feature worth seeking out — especially if you’re hiking or walking in areas with other dogs or cyclists.
Harness vs Collar: Which Should You Use?
Collars and harnesses each have their place, and most owners end up using both. A collar is ideal for carrying ID tags and is perfectly fine for dogs that walk calmly on lead. A harness gives you more control and distributes pressure more evenly — which is better for dogs that pull, dogs with neck problems (especially brachycephalic breeds like Pugs and French Bulldogs), and puppies whose tracheas are still developing.
In general, we’d recommend a harness as your primary walking tool and a flat collar for ID tags only. This is especially true for puppies, small breeds, and any dog that has a tendency to lunge or pull. Many professional trainers now advise against collar-only walking for dogs that haven’t yet learned loose-lead manners.
Choosing a Harness for a Puppy
Puppies grow quickly, which makes sizing a challenge. Buy a harness with plenty of adjustability so you get more mileage out of it, but accept you’ll likely need to size up within six months for medium or large breeds. A lightweight, padded vest-style harness is often the most comfortable option for young puppies, as it distributes pressure across their growing frame.
Avoid harnesses that restrict shoulder movement in puppies — this can interfere with their natural gait as they develop. Look for a design where the chest strap sits at the sternum rather than across the upper shoulder joint. If you’re unsure, ask your vet or a professional trainer for a fit check.
How Much Should You Spend?
Harness prices in the UK range from under £10 to well over £60, and as with most things, you broadly get what you pay for.
- Budget (under £20): Fine for occasional use, occasional walks, or puppies you know you’ll size out of quickly. Hardware and stitching quality are often lower.
- Mid-range (£20–£40): The sweet spot for most owners. You’ll find good adjustability, padded panels, and metal hardware. Brands like Ancol, Company of Animals and PetSafe sit here.
- Premium (£40+): Brands like Ruffwear, Julius K9 and Hurtta build harnesses that last years of daily use. Worth investing in for large or powerful dogs, or if you walk in all weathers year-round.
Frequently Asked Questions
Can my dog wear a harness all day?
Most harnesses are not designed for all-day wear. Prolonged use can cause rubbing under the armpits or across the chest, particularly if the fit isn’t perfect. We’d recommend removing the harness when your dog is at home and resting. If your dog wears a harness for extended periods — say, during camping or hiking trips — check for any signs of rubbing each evening.
Is a harness better than a collar for a dog that pulls?
Yes — a front clip or dual clip harness is almost always a better choice for dogs that pull. A collar puts pressure directly on the neck and trachea, which can cause or worsen injuries over time, particularly in small breeds. A front clip harness interrupts pulling behaviour naturally without causing pain.
How tight should a dog harness be?
The “two finger rule” is a good guide: you should be able to slide two fingers under any strap comfortably. If you can’t, the harness is too tight. If you can fit more than two fingers easily, it’s too loose and your dog may be able to back out of it. Pay particular attention to the fit around the chest and behind the front legs, where rubbing is most common.
What harness do dog trainers recommend?
Many UK dog trainers recommend front clip or dual clip harnesses for dogs in training, with brands like Ruffwear, Julius K9, and the PetSafe Easy Walk coming up frequently. The key is finding a harness that fits your specific dog well — even the best harness on the market won’t work properly if it’s the wrong size or poorly adjusted.
Can I use a harness for a reactive dog?
A front clip or dual clip harness can be very helpful for reactive dogs as it gives you better directional control than a back clip. Some owners also use a double-ended lead clipped to both the front and back D-rings simultaneously, which gives maximum control with minimal discomfort. If your dog’s reactivity is severe, we’d always recommend working with a qualified trainer alongside any equipment changes.
Final Thoughts
The right harness for your dog depends on three things: their size, their behaviour on lead, and how often you walk them. For most dogs, a dual clip harness with a padded chest plate, metal hardware, and at least four adjustment points will cover all bases. Measure your dog’s chest girth before you buy, choose a reputable UK brand, and don’t be afraid to return it if the fit isn’t right — most retailers are accommodating.
For specific product recommendations, take a look at our Best Dog Harness UK 2026 review and our Best No-Pull Harness UK 2026 guide, where we’ve tested and rated the top options available on Amazon UK and Pets at Home.
