Harness or collar? This question determines health, safety, and relaxed walks. The short answer: It depends on the dog and the situation – but research is clear on one point. This guide shows you what matters, what studies prove, and what trainers recommend.
Key takeaways
- Collar: light, quick, ideal for ID tags and calm dogs on a loose leash.
- Harness: distributes pressure to the chest instead of the neck – the gentler choice for pullers, puppies, and small breeds.
- Proof: Pulling on a collar measurably increases intraocular pressure – not on a harness (study below).
What science says
The argument "harnesses are gentler on the neck" is not just a gut feeling, but measurable:
Study 1: Collar increases intraocular pressure
Pauli et al. (2006, Journal of the American Animal Hospital Association) examined 26 dogs: When pressure was applied to the neck via a collar, intraocular pressure significantly increased – but not via a harness. Reason: Pressure on the jugular veins causes blood to pool up to the eyes. Authors' recommendation: Dogs with eye problems or glaucoma should wear a harness.
Source: Pauli et al., 2006 (JAAHA)
Study 2: Also considering breathing & short-nosed dogs
A newer study (Bailey et al., 2025, Veterinary Medicine and Science) compared collars and harnesses in short- and long-nosed dogs and confirmed the influence of neck pressure on intraocular pressure and respiration – particularly relevant for sensitive and brachycephalic dogs.
Collar or harness? A direct comparison
| Criterion | Collar | Harness |
|---|---|---|
| Pressure when pulling | concentrated on the neck | distributed to chest & shoulders |
| Intraocular pressure when pulling | increases (study) | unchanged (study) |
| Ideal for | calm dogs, ID tag | pullers, puppies, small & short-nosed breeds |
| Escape-proof | lower | higher (multiple fasteners) |
| Control | good for calm dogs | very good, especially with front ring |
When a collar makes sense
A collar is the right choice if your dog has learned to walk on a loose leash and doesn't constantly pull. It goes on in seconds and holds ID tags and address. Rule of thumb: two fingers should fit comfortably between the neck and the collar.
When a harness is the better choice
You should opt for a harness for dogs that pull, for puppies, for small or short-nosed breeds (e.g., pug, French bulldog), and for escape artists. It also provides more security when jogging and on longer walks.
No-Pull, Y-shape & Co. – what matters
- Y-shape at the neck: leaves shoulders free and doesn't press on the larynx.
- No-Pull / Front ring: gently guides pulling dogs to the side and facilitates training.
- Fit & adjustability: multiple adjustment points, secure fit without chafing.
- Material: skin-friendly, light, quick-drying.
Measuring correctly: the right size
- Chest circumference (harness): measure at the widest point behind the front legs.
- Neck circumference (collar): measure where the collar sits.
- 2-finger rule: two fingers should fit between the dog and the collar/harness.
| Size | Chest circumference (approx.) | Breed orientation |
|---|---|---|
| XS | 35–45 cm | Chihuahua, puppies |
| S | 45–55 cm | Dachshund, Maltese |
| M | 55–68 cm | Beagle, Cocker Spaniel |
| L | 68–85 cm | Labrador, German Shepherd, Vizsla |
Orientation values – the size chart on the product page is decisive.
Our recommendation: chest-friendly designer harnesses
Our designer harnesses are designed as Y-harnesses with a no-pull ring, quick-drying, and multiply adjustable.
Cheaper as a set
Collar, chest-friendly harness & hands-free leash in a matching look – coordinated and cheaper than individually.
View complete set – €129Frequent Questions
Is a harness really better than a collar?
For dogs that pull, generally yes – it protects the neck, trachea, and according to studies, also intraocular pressure. For calm dogs, a collar is sufficient.
Which harness for strong pulling?
A well-fitting Y-harness with a front ring (no-pull), combined with leash training using positive reinforcement.
Does a harness harm the gait?
No, as long as it leaves the shoulder free. Pay attention to the Y-shape at the neck – wide chest plates across the shoulder can restrict movement.
Sources
- Pauli A. M. et al. (2006): Effects of the Application of Neck Pressure by a Collar or Harness on Intraocular Pressure in Dogs. J Am Anim Hosp Assoc. Link
- Bailey et al. (2025): Effect of a Collar and Harness on Intraocular Pressure and Respiration Rate. Vet Med Sci. Link
This guide does not replace veterinary advice. For coughing, pain, or eye problems, please consult a veterinarian.
