Size Guide & How to Measure
(because size matters)
Because getting the right fit isn’t just about looking good… Whether your dog’s a tiny trendsetter or a big muddy adventurer, getting the right fit means everything — for comfort, safety, and confident strutting. This page will help you find the perfect size across our full range of accessories.
Size Guides for Harnesses
Dog Harness Size Guide
A well-fitted harness means fewer rubs, no wriggles, and a pup who’s ready to strut, not sulk. It offers better control, reduces the risk of injury, and ensures your dog feels as fabulous as they look. And let’s be honest — a grumpy dog in an ill-fitting harness is nobody’s idea of a good time, however good they look.
Use our guides below to find the perfect size based on the type of harness. Always measure your dog before placing an order. When in doubt, size up for comfort.
Types of Dog Harnesses Chart
Not all harnesses are created equal—and not all dogs love the same fit. At The Luna Collection, we offer a range of harness styles to suit different personalities, walking styles, and comfort preferences.
Below is a quick chart based on types of dog harnesses to help you understand the differences between our three harness types.
Comparison of Our Harness Types
| Harness Type | Adjustability | Design Style | Best For |
|---|---|---|---|
| Step-In | Chest only | Step-in | Best for dogs who dislike anything over their head — ideal for anxious pups, rescues, and breeds prone to BOAS or SM like Pugs, Frenchies, and Cavaliers (XXS–XXL). |
| Adjustable | Neck + Chest | Over-the-head | Great for pullers, wrigglers, or growing pups — ideal for small to medium dogs who need a snug fit with neck and chest adjustment (XS–L). |
| Luxury Leather | None | Step-in | Perfect for little trendsetters and stylish pups — ideal for special occasions or polished everyday looks for small to medium dogs (S–L). |
Step-In Harnesses for dogs
- QUICK TIP: Step-in harnesses are especially helpful for nervous pups or dogs with sensitive necks
Our signature Step-In Harnesses are designed for dogs who just don’t do over-the-head styles. Whether your pup is a little anxious, wiggly, or simply prefers a fuss-free fit, this harness is the one for them.
- Easy step-in design — no straps over the head
- Adjustable at the chest for a secure yet comfy fit
- Ideal for dogs who dislike overhead harnesses
- Lightweight, breathable, and soft on fur.
Size Chart
Choose your pup’s size based on their chest measurement:
- XXS: 34–39 cm
- XS: 36–41 cm
- S: 43–47 cm
- M: 47–52 cm
- L: 51–56 cm
- XL: 58–66 cm
- XXL: 69–83 cm
How to Measure
- Measure around your dog’s neck where the harness would naturally sit
- Measure around the widest part of the chest, just behind the front legs
- Keep the tape snug but not tight — two fingers should fit comfortably underneath
- If your pup is between sizes, we recommend sizing up for comfort
- A treat for your model is always a good idea!
Why Choose a Step-In Harness?
Our Step-In Harnesses are a gentle, stress-free option for dogs who find over-the-head styles overwhelming or uncomfortable. Whether your pup is a sensitive soul, a nervous rescue, or a breed with specific health concerns, step-in designs offer a calm and comfortable alternative.
Here’s why step-in harnesses are a firm favourite:
- Head-Free Fit – Ideal for anxious or rescue dogs who panic when anything goes over their head. Simply step in, clip at the back, and you’re ready for walkies—no drama, no distress.
- Relieving Strain on the Neck – Step-in harnesses are designed to distribute pressure across the chest and back, completely avoiding the neck. This makes them perfect for flat-faced breeds like Pugs and Frenchies (prone to BOAS), as well as Cavaliers with conditions like Syringomyelia.
- Quick and Fuss-Free – No need to fiddle with straps around the head. Just pop your dog’s front legs through the openings, fasten, and go. It’s that easy.
- Soft, Lightweight Comfort – Made with breathable neoprene and minimal straps, these harnesses are gentle on fur and comfortable for all-day wear.
- Safe and Secure – A well-fitted step-in harness hugs the chest and shoulders, offering a secure fit even for curious explorers or occasional Houdinis.
- Inclusive Sizing – Available from XXS to XXL, our harnesses are suitable for a wide variety of body shapes and sizes, from dainty toy breeds to sturdier sidekicks.
If your dog’s a bit sensitive, has a health condition, or simply prefers a harness that doesn’t interfere with their glorious mane, a step-in style could be exactly what they need.
Neck and Chest Adjustable, Over-the-Head Harnesses
- QUICK TIP: Perfect for pullers, pups in training, or those who need a more secure, structured fit.
Our stylish Adjustable Harnesses are ideal for pups who don’t mind a quick slip over the head. With adjustable straps at both the neck and chest, they’re brilliant for dogs who are still growing, in-between sizes, or just need a snug, secure feel.
- Easy overhead design with adjustable neck and chest straps
- Great for training, pulling, or dogs with unique proportions
- Soft, breathable neoprene for all-day comfort
- Sturdy D-ring for lead attachment
- Lightweight and stylish — no compromise on looks or function.
Size Chart
Choose your pup’s size based on both neck and chest measurements:
- XS: Neck 29–36 cm, Chest 36–48 cm
- S: Neck 35–44 cm, Chest 41–54 cm
- M: Neck 39–51 cm, Chest 46–61 cm
- L: Neck 42–56 cm, Chest 57–83 cm
How to Measure
- Measure around the widest part of your dog’s chest, just behind the front legs
- Keep the tape snug but not tight — two fingers should fit underneath
- If your pup is between sizes, we recommend sizing up for comfort
- And of course, a treat for your model is highly encouraged!
Why Choose an Adjustable Harness?
- Better Control for Pullers – The overhead style allows for snug chest and neck fit, and many styles (including ours) pair well with front-clip leads for added control.
- Easy On, Easy Off – Simply slip it over your pup’s head and clip under the chest. No complicated leg manoeuvres needed!
- Snug Yet Comfy Fit – Fully adjustable at the neck and chest, making them ideal for dogs in-between sizes or still growing.
- Security – Less chance of wriggling free compared to step-in designs—especially handy for escape artists.
- Gentle on Fur – Padded neoprene and minimal straps mean no matting, rubbing, or nasty knots.
- Training-Friendly – These harnesses are a great choice for training walks, especially if your dog tends to pull.
Luxury Leather Harnesses
- QUICK TIP: Best for little trendsetters, special occasions, and pups with a taste for luxury.
Our Luxury Leather Harnesses are beautifully handcrafted and timeless in design. Unlike our other styles, these harnesses are not adjustable, so an accurate measurement is essential before ordering.
- Classic step-in style
- Handmade using high-quality leather
- No adjustment points – exact fit required
- Limited stock – this range has been discontinued
- Ideal for dogs who love looking effortlessly elegant
Size Chart
Choose your pup’s size based on a single chest measurement:
- S: Chest 36 cm
- S/M: Chest 42 cm
- M: Chest 48 cm
- M/L: Chest 53 cm
- L: Chest 58 cm
How to Measure
- Measure around the widest part of your dog’s chest, just behind the front legs
- Keep the tape snug but not tight — leave room for two fingers
- As these harnesses do not adjust, double-check your measurement before ordering
- And yes — a stylish pup deserves a reward for their modelling efforts!
Dog Harness Size Chart by Breed
Looking for a quick starting point? Our dog harness size chart by breed offers a general guide to help you choose the right size based on common dog breeds. Of course, every dog is different — even within the same breed — so this chart is just for guidance.
Always measure your dog before ordering to ensure the best possible fit. After all, your chunky Cavapoo or petite Cocker might surprise you!
| Harness Type | Size | Example Breeds |
|---|---|---|
| Step-In | XXS | Toy breeds and very small puppies |
| Step-In | XS | Chihuahua, Yorkshire Terrier, Dachshund (miniature), Toy Poodle, Pomeranian |
| Step-In | S | Cavapoo, Cavachon, Shih Tzu, Toy Poodle, Pomeranian, Dachshund |
| Step-In | M | Cavalier King Charles Spaniel, Pug, Bichon Frise, larger Cavapoos and Cavachons |
| Step-In | L | Larger Cavaliers, Cockapoos, Boston Terrier |
| Step-In | XL | Larger Cocker Spaniel, slim Springer Spaniel, French Bulldog |
| Step-In | XXL | Broad Cocker Spaniel, Springer Spaniel, slim Dalmatian |
| Adjustable | XS | Chihuahua, Toy Poodle, Dachshund, Jack Russell, Yorkshire Terrier |
| Adjustable | S | Cavapoo, Cavachon, Pug, Shih Tzu, Cavalier King Charles Spaniel, small Cocker Spaniel |
| Adjustable | M | Larger Cavapoos and Cavachons, Bichon Frise, larger Cavaliers, Cockapoo, Cocker Spaniel, French Bulldog |
| Adjustable | L | Springer Spaniel, Staffie, larger French Bulldog, Labrador (slim), Golden Retriever (slim), Dalmatian |
Think of this chart as a starting point, not a rulebook. Every pup is unique — so please grab the tape measure (and a treat) before you order!
