Dog Leashes and Harnesses: How Should You Choose?

ImmunityQ&AMeongsiljang Veterinary Advisory Board

Dog collars and harnesses each have their own pros and cons. From a veterinary perspective, we’ll guide you on how to choose the right one based on your dog’s breed, age, health status, and walking habits.

What’s the Difference Between Leashes and Harnesses?

A comparison between dogs wearing collars and those wearing harnesses

Dog leashes and harnesses are essential walking gear that provide safety and control, but they differ in where they attach and how force is distributed, so it’s important to choose the right one for your dog’s needs. The key factors to consider are tracheal health and body type. Small breeds with slender necks or a risk of tracheal collapse should wear a harness, while larger dogs that require more control generally do best with a collar. However, the best approach is to remain flexible and adjust based on your dog’s breed and health status.

Basic Differences Between Leashes and Harnesses

As the name suggests, a collar concentrates force on the neck. In contrast, a harness distributes pressure across the chest, shoulders, and back. Veterinary behavior textbooks note that dogs wearing standard collars who pull excessively or are dragged may exhibit choking-like symptoms, such as gagging or difficulty breathing. Therefore, for dogs that frequently pull on the leash, a front-clip harness is recommended over a standard collar, as it reduces pulling and offers greater safety. Even for short walks, if your dog has a habit of pulling hard due to excitement, switching to this type of equipment helps prevent cumulative strain on the neck.

Leash vs. Harness: A Quick Comparison

Item	Collar	H-Type Harness	Y-Type Harness
Pressure Point	Neck (trachea)	Chest + shoulders	Chest (sternum)
Tracheal Compression Risk	High	Low	Very low
Control	Strong	Medium	Medium
Shoulder Movement Restriction	None	Possible	Almost none
Escape Risk	Low	Medium	Medium
Recommended For	Adult dogs needing control	General small/medium dogs	Young puppies, tracheal collapse

The optimal equipment may vary depending on breed, body type, and health condition.

When a Leash Is Suitable

A harness isn’t the right choice in every situation. When control is crucial, a collar can be more effective. - During adult dog training: Signals are delivered quickly and clearly. - Basic walks with large breeds: Immediate control is often necessary. - Healthy adult dogs without neck issues: A collar is less cumbersome for short walks. - ID tags and microchips: Required by law for pet registration. However, if your dog has a habit of repeatedly pulling or dragging on the leash, avoid using a collar and focus on training instead.

Dogs Who Should Absolutely Avoid Leashes

If any of the following apply, it’s safer to avoid pressure on your dog’s neck. We recommend switching from a standard collar to a front-clip harness that reduces pulling force. - Small breeds with narrow, delicate airways, such as Pomeranians, Yorkshire Terriers, and Chihuahuas - Brachycephalic (short-nosed) breeds like Shih Tzus, Pugs, and Bulldogs, which have narrowed airways and increased respiratory strain - Dogs with a medical history requiring avoidance of neck pressure, such as intervertebral disc disease or cervical spine conditions - Cases involving eye conditions where neck pressure is a concern; consult your veterinarian - Dogs that cough or make choking sounds while pulling on the leash during walks

When a Harness Is Suitable

Harnesses distribute pulling force across the chest and shoulders, reducing strain on the neck. They are especially recommended in the following situations: - Small breeds in general: Their tracheas are narrower, making them more vulnerable to tracheal irritation from leash pulling. - Puppies: Their tracheas and cervical vertebrae are not yet fully developed. - Senior dogs: They may be experiencing degenerative changes in the cervical spine. - Dogs diagnosed with tracheal collapse: Veterinarians typically recommend harnesses for these patients. - Dogs with heart or respiratory conditions: Harnesses help reduce the risk of triggering coughing episodes.

Features of Different Harness Types

The type of harness you choose can affect your dog’s body differently. - Front-clip harness (Easy Walk style, chest D-ring): The leash attaches to the front of the chest, reducing pulling and making it easier to change direction. This type is consistently recommended in veterinary textbooks as the most ideal in terms of safety and control. - Y-shaped harness (V-shape at the center of the chest): It doesn’t interfere with shoulder movement, placing less strain on the body. - H-shaped harness (horizontal chest strap): The horizontal strap across the chest passes in front of the shoulders, which may reduce stride length. - Vest-style harness (belt type): The wide coverage distributes pressure well, but it can get warm in summer. For most pet owners, the front-clip harness (Easy Walk style) is most recommended for reducing pulling and ensuring safety. Combining it with loose-leash walking training makes it even more effective.

Checking for Proper Harness Fit

Even a high-quality harness can be more dangerous than a collar if fitted incorrectly. Please be sure to check the following guidelines: - The Two-Finger Rule: You should be able to comfortably slide two fingers between the harness and your dog’s body. - No Armpit Irritation: If the straps dig into the armpits, they can cause hair loss and dermatitis. - Freedom of Shoulder Movement: The chest strap should not restrict your dog when they extend their front legs. - Secure Fit: The harness should not slip forward over your dog’s head when they lower it. - Regular Checks: Growing puppies require size re-evaluations every 2–3 weeks.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Does using a collar really cause airway problems?

Repeatedly pulling hard on a collar puts pressure on the neck and can cause choking-like symptoms, such as coughing or gagging and difficulty breathing. Small-breed dogs are especially vulnerable because their airways are narrower. For puppies that frequently pull on the leash, we recommend using a front-clip harness, which reduces pulling and offers greater safety, while simultaneously training them to walk on a loose leash.

Is it true that dogs tend to pull more when wearing a harness?

A back-clip harness, with the leash attached to the back, efficiently transfers pulling force and can actually encourage pulling—this is why sled dogs use this style. In contrast, a front-clip harness, with the leash attached to the chest, turns the dog’s body toward the handler when they pull, helping to reduce pulling. However, for dogs that pull severely, equipment alone isn’t enough; it’s best to combine it with loose-leash walking training.

Can I use a leash and a harness together?

Yes, it’s possible. In fact, many pet owners attach the ID tag and microchip to the collar, while using a harness and leash for better control during walks. Wearing both at the same time is perfectly fine and can also help prevent escapes.

My dog hates wearing a harness. What should I do?

It’s common for pets to resist wearing a harness at first. Start by letting them sniff the harness while offering treats, gradually building familiarity through **desensitization training**. Never force it on them—instead, allow about two weeks, letting them wear it for just five minutes a day.

Which is better for a Shih Tzu, a collar or a harness?

Because Shih Tzus are brachycephalic (short-nosed) breeds, they often have structural airway issues such as soft palate elongation, which places a significant burden on their respiratory system. Therefore, a harness is the safer choice. Pressure on the neck from a collar can further strain their already narrowed airways. We recommend using a front-clip harness (such as an Easy Walk style).

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References

[1] Ettinger SJ, Feldman EC, Côté E. Textbook of Veterinary Internal Medicine, 8th Edition. Elsevier, 2017 — Respiratory System Chapter

[2] Carter A, McNally D, Roshier A. Canine collars: an investigation of collar type and the forces applied to a simulated neck model. Veterinary Record, 2020

[3] Pauli AM et al. Effects of the application of neck pressure by a collar or harness on intraocular pressure in dogs. Journal of the American Animal Hospital Association, 2006