How to Choose a Harness That Truly Fits Your Dog

When you start looking for a new harness for your dog, you'll probably come across dozens of articles titled "Harness or Collar?" The truth, however, is that there is no single right answer. Just as there isn't one perfect car for every driver, there isn't one universally perfect harness for every dog.

A harness that fits a slim Whippet perfectly may be completely unsuitable for a French Bulldog or a Basset Hound. That's why the most important factor isn't the brand or the colour – it's your dog's body shape.

In this article, we'll show you what to look for, the most common mistakes people make when choosing a harness, and why two dogs of the same weight often need completely different harnesses.

Look at Your Dog First, Not the Size Label

Many people choose a harness based on their dog's weight. In reality, weight is only a rough guideline. Much more important are:

• Chest circumference
• Neck circumference
• Back length
• Chest width
• Muscle build
• Leg length
• Movement and gait

For example, a French Bulldog and a Whippet may both weigh around 12 kilograms (26 lbs). Yet they won't fit the same harness style or adjustment. That's why we always recommend measuring your dog carefully first and then comparing those measurements with the size chart for the specific product.

Every Breed Has Slightly Different Needs

French Bulldog

French Bulldogs have broad chests, thick necks, and relatively short bodies. A suitable harness should:

• Fit securely around their broad chest.
• Allow unrestricted shoulder movement.
• Avoid rubbing under the front legs.
• Stay stable even during sudden changes of direction.

A common mistake is choosing a harness based solely on weight. Two French Bulldogs of the same weight may have completely different proportions.

Pug

Pugs are a brachycephalic breed, meaning they have shortened skulls and more sensitive airways. For this reason, a well-fitting harness is often more comfortable than a collar, which may put pressure on the neck when the dog pulls. However, it's important to choose a design that doesn't restrict the movement of the front legs.

Whippet

Whippets have narrow waists, deep chests, and very athletic builds. If the harness is even slightly too large, it can rotate or slip during movement. That's why precise measurements and fine adjustment are particularly important for this breed.

Dachshund

Their long bodies and short legs make Dachshunds one of the most distinctive breeds. A harness should therefore accommodate their longer torso, avoid extending too far back, prevent pressure on the spine, and allow unrestricted movement of the chest.

Basset Hound

Basset Hounds are among the breeds for which choosing the right harness can be surprisingly challenging. They typically have long bodies, very deep chests, and short legs. Their front end is generally heavier, and loose skin can also present a fitting challenge.

A poorly fitting harness may slide towards the neck, rub behind the elbows, twist while walking, or appear to fit well when the dog is standing but not when moving. That's why we recommend taking extra care when selecting a harness for a Basset Hound.

Border Collie

Border Collies are highly active dogs that spend a great deal of time on the move. Their harness should be lightweight, durable, fully adjustable, and comfortable enough for long walks and hikes. It should never restrict the movement of the shoulder blades or shoulders while running.

Labrador Retriever

Labradors have strong chests and thick necks, and they're often very energetic. They benefit from a harness with a sturdy construction, high-quality buckles, and wider straps that distribute pressure more evenly.

When Should You Choose a Collar and When a Harness?

There is no universal rule that says a harness is always better than a collar. Both have their advantages, and many dog owners use both together.

A collar is an excellent choice if:

• You need to clip the leash on quickly.
• You mainly go on short walks.
• Your dog doesn't pull on the leash.
• Your dog wears an ID tag or GPS tracker.
• You prefer the lightest everyday option.

A harness is often a better choice if:

• You enjoy longer walks.
• You regularly go hiking or on outdoor adventures.
• You have an active dog.
• Your dog pulls on the leash.
• You have a puppy.
• You own a brachycephalic breed, such as a Pug or French Bulldog.

Today, many owners use both—a collar for identification and a harness for walks.

How Can You Tell If a Harness Doesn't Fit?

A properly fitted harness should feel almost unnoticeable to your dog. It shouldn't restrict movement or force your dog to change its natural gait.

Pay attention if:

• The harness twists while walking.
• It slides towards the neck.
• It rubs behind the front legs.
• Your dog bites at it or tries to remove it.
• Your dog refuses to move after it's put on.
• The straps run across the shoulder blades and restrict movement.
• You can't comfortably fit about two fingers between the harness and your dog's body—or, on the other hand, the harness is too loose.

After fitting the harness, observe your dog not only while standing but also while walking, running, and turning. Movement is usually when you'll notice whether the harness truly fits.

Still unsure whether a collar or a harness is the better choice for your dog? You might first want to read our article "Collar or Harness: Which Is Better for Your Dog?", where we compare the advantages of both options.

The Most Common Harness Buying Mistakes

• Choosing based only on weight: Two dogs weighing exactly the same can have completely different body shapes.
• Buying a harness "to grow into": A harness that's too large won't be safe or comfortable. This is especially true for puppies.
• Adjusting it too loosely or too tightly: Both can cause discomfort, rubbing, or poor fit.
• Choosing based only on appearance: Design matters—but only after you've found a harness that fits properly.
• Copying another dog's setup: Just because a particular model fits your neighbour's dog doesn't mean it will fit yours.

How We Choose Harnesses at CALIDU

Over the years of designing dog equipment, we've learned one important thing—no size chart can perfectly account for every dog's unique body shape.

We regularly see two dogs of the same weight needing different sizes or completely different adjustments. A French Bulldog and a Whippet may both weigh 12 kilograms, yet the same harness design won't fit both. Likewise, even two dogs of the same breed may have very different chest widths or levels of muscle development.

That's why we always recommend choosing a harness based on your dog's actual measurements, carefully reviewing the product's size chart, and contacting us if you're unsure. We'll be happy to help you find the right size so your dog's harness is safe, comfortable, and fits exactly as it should.

Final Thoughts

Choosing the right harness isn't just about selecting the correct size—it's about understanding your dog's unique body structure. Every breed has its own characteristics, and even dogs of the same breed can differ significantly.

If you base your choice on your dog's actual measurements, movement, and individual needs, you'll end up with equipment that serves them well on everyday walks as well as bigger adventures together.

And if you're still unsure, don't hesitate to get in touch. We'd be happy to help you choose a harness that truly fits your four-legged companion.

Together, every step of the way.